How to use Wheels in a sentence
As the teams came to a halt, the rasp of leather against sandy wheels assured her that the other wagons were following suit.
By an invention probably due to Humfray Cole and published in 1 578 by William Bourne in his Inventions and Devices, it was proposed to register a ship's speed by means of a "little small close boat," with a wheel, or wheels, and an axle-tree to turn clockwork in the little boat, with dials and pointers indicating fathoms, leagues, scores of leagues and hundreds of leagues.
As the big wheels turned, they tossed sand up and over the rim.
The wheels were already in motion.
I love my wheeled wonder, my palace on wheels, but it's unique and easily remembered.Advertisement
They fastened each of these wheels to the end of an iron rod which they passed through the boat from side to side.
The wheels of the Conestoga wagons had been modified with wide rims to even the load on the sand.
I've purchased a home on wheels for my journeys.
She talks forward of the spring; seeing the flowers and the young people riding on these new wheels called bicycles, but I think to myself she'll not last the winter.
The postilion started, the carriage wheels rattled.Advertisement
All her skills were occupied simply keeping all four wheels on the ground.
Katie hit the accelerator and the wheels spun wildly, instantly coating Carmen and Alex with mud.
She released his arm only to grab it again as one of the buggy wheels dropped into a pothole.
I parked my home on wheels under a tree and unbound my reluctant guest.
Another opportunity will present itself I'm sure, but not where I might be identified with my perfect house on wheels and electric bicycle.Advertisement
But I am a patient man and the sun is shining, the brook that fronts my home on wheels is singing.
A blacksmith in Gravette was making the wheels, but the rest of the buggy was complete, right down to the leather seats.
The wheels finally came in!
She sounds like one of those motorcycles with four wheels.
Wheels crunched on gravel as a car stopped in her drive.Advertisement
The wheels symbolize divine omniscience and control, and the whole vision represents the coming of Yahweh to take up his abode among the exiles.
Strong worms and wheels are substituted for the light clockwork.
In the first instance he proposed to place the guiding wheels outside the bearing wheels, and the Nanpantan line was laid on this plan with a width of 5 ft.
The man who explains the movement of the locomotive by the smoke that is carried back has noticed that the wheels do not supply an explanation and has taken the first sign that occurs to him and in his turn has offered that as an explanation.
I pass farm country, for miles and miles as I travel in my home on wheels.Advertisement
Brandon Westlake remained under his colorful cover until he was sure the Deans were with wheels.
Then she added, Every volunteer fire buck and EMT has a noise on his wheels.
He repeated her comment about the Porsche, "Nice wheels."
Yeah, this is one slick pair of wheels.
Wheels of understanding began turning but before he could collect his thoughts, Randy returned to the room.
I didn't have wheels and Byrne offered to take me to Blooming Grove.
The ox-wagons with their solid wheels, and the curious water-wheels of brushwood with earthenware pots tied on to them and turned by a blindfolded donkey, are picturesque.
Immediately outside the city limits in 1905 there were many large manufactories, including the repair shops of the Southern railroad; iron and steel, car wheels and cotton-oil were among the products of the suburban factories.
Jib cranes can be subdivided into fixed cranes and portable cranes; in the former the central post or pivot is firmly fixed in a permanent position, while in the latter the whole crane is mounted on wheels, so that it may be transported from place to place.
The toothed wheels give a slightly better efficiency, but the worm gear is somewhat smoother in its action and entirely silent; the noise of gearing can, however, be considerably reduced by careful machining of the teeth, as is now always done, and also by the use of pinions made of rawhide leather or other non-resonant material.
Obviously, nearly every kind of crane can be made portable by mounting it on a carriage, fitted with wheels; it is even not unusual to make the Portable Scottish derrick portable by using three trucks, one under the mast, and the others under the two back legs.
From the lower flange of a suspended !; runway, made of a single I section, run wheels, from the axles of which the transporter is suspended.
In time it became a common practice to cover them with a thin sheathing or plating of iron, in order to add to their life; this expedient caused more wear on the wooden rollers of the wagons, and, apparently towards the middle of the 18th century, led to the introduction of iron wheels, the use of which is recorded on a wooden railway near Bath in 1734.
The Rocket possessed the three elements of efficiency of the modern locomotive - the internal water-surrounded fire-box and the multitubular flue in the boiler; the blast-pipe, by which the steam after doing its work in the cylinders was exhausted up the chimney, and thus served to increase the draught and promote the rapid combustion of the fuel; and the direct connexion of the steam cylinders, one on each side of the engine, with the two driving wheels mounted on one axle.
After the success of the Rocket, the Stephensons received orders to build seven more engines, which were of very similar design, though rather larger, being four-wheeled engines, with the two driving wheels in front and the cylinders behind; and in October 1830 they constructed a ninth engine, the Planet, also for the Liverpool & Manchester railway, which still more closely resembled the modern type, since the driving wheels were placed at the fire-box end, while the two cylinders were arranged under the smoke-box, inside the frames.
It had a vertical boiler, and was carried on four wheels all coupled, the two cylinders being placed in an inclined position and having a bore of about 6 in.
Baldwin, the founder of the famous Baldwin Locomotive Works in Philadelphia, built his first engine, Old Ironsides, for the Philadelphia, Germantown & Morristown railroad; first tried in November 1832, it was modelled on Stephenson's Planet, and had a single pair of driving wheels at the firebox end and a pair of carrying wheels under the smoke-box.
While braking, spragging, or chocking wheels 15 627 6.
The theoretical limit is about i in 16; between I in 20 and 1 in 16 a steam locomotive depending on the adhesion between its wheels and the rails can only haul about its own weight.
Blenkinsop placed the teeth on the outer side of one of the running rails, and his reason for adopting a rack was the belief that an engine with smooth wheels running on smooth rails would not have sufficient adhesion to draw the load required.
This sliding movement is resisted by placing a check rail on the inner side of the inner rail, to take the lateral thrust of the wheels on that side.
The gauge of a railway is the distance between the inner edges of the two rails upon which the wheels run.
In whatever form energy is produced and distributed to the train it ultimately appears as mechanical energy applied to turn one or more axles against the resistance to their rotation imposed by the weight on the wheels and the motion of the train.
Hence if all the energy supplied to the train is utilized at one axle there is the fundamental relation RV (I) Continuing the above arithmetical illustration, if the wheels to the axle of which the torque is applied are 4 ft.
The fundamental condition governing the design of all tractive machinery is that the wheels belonging to the axles to which torque is applied shall roll along the rails without slipping, and exert a tractive force on the train.
Assuming the wheels to roll along the rail without slipping, this couple will be equivalent to the couple formed by the equal opposite and parallel forces, F 1 acting in the direction shown, from the axle-box on to the frame, and F 1 =µ0, acting along the rail.
The practical effect of this opposite couple is slightly to tilt the frame and thus to redistribute slightly the weights on the wheels carrying the vehicle.
The maximum weight which one pair of wheels are usually allowed to carry on a first-class track is from 18 to 20 tons.
Every axle of an electric locomotive may thus be subjected to a torque, and the large weight which must be put on one pair of wheels in order to secure sufficient adhesion when all the driving is done from one axle may be distributed through as many pairs of wheels as desired.
Such an arrangement would be ideally perfect from the point of view of the permanent-way engineer, because it would then be possible to distribute the whole of the load uniformly between the wheels.
To obtain the tractive force the weight on the coupled wheels must be about five times this amount - that is..
Hence, if p is the maximum value of the mean effective pressure corresponding to about 85% of the boiler pressure,, uW = pd 2 le /D (26) is an expression giving a relation between the total weight on the coupled wheels, their diameters and the size of the cylinder.
Assuming that the frictional resistance at the rails is given by the weight on the wheels, the total weight on the driving-wheels necessary to secure sufficient adhesion to prevent slipping must be at least 8.3 X5 =41.5 tons.
When the road leads the train up an incline, however, the tractive force must be increased, so that the need for coupled wheels soon arises if the road is at all a heavy one.
The drivingwheels are coupled to a pair of trailing wheels.
The low-pressure cylinders drive on the leading crank-axle with cranks at right angles, the highpressure cylinders driving on the trailing wheels.
A highand low-pressure cylinder are cast together, and the piston-rods belonging to them are both coupled to one cross-head which is connected to the driving-wheels, these again being coupled to other wheels in the usual way.
The revolving masses are truly balanced by balance weights placed between ' the spokes of the wheels, or sometimes by prolonging the crank-webs and forming the prolongation into balance weights.
It is also the custom to balance a proportion of the reciprocating masses by balance weights placed between the spokes of the wheels, and the actual balance weight seen in a driving-wheel is the resultant of the separate weights required for the balancing of the revolving parts and the reciprocating parts.
A convenient way of describing any type of engine is by means of numerals indicating the number of wheels - (I) in the group of wheels supporting the leading or chimney end, (2) in the group of coupled wheels, and (3) in the group supporting the trailing end of the engine.
Thus 4-4-2 represents a bogie engine with four-coupled wheels and one pair of trailing wheels, the wellknown Atlantic type; 4-2-2 represents a bogie engine with a single pair of driving-wheels and a pair of trailing wheels; 0-4-4 represents an engine with four-coupled wheels and a trailing bogie, and 4-4-o an engine with four-coupled wheels and a leading bogie.
Engines of this class, with 78-inch driving wheels and the leading axle fitted with Webb's radial axle-box, for many years did excellent work on the London & North-Western railway.
Its critics, however, accuse it of lack of stability, and assert that the use of large leading wheels as drivers results in rigidity and produces destructive strains on the machinery and permanent way.
Their boilers are of relatively large proportions for the train weight and average speed, and the driving wheels of small diameter, a large proportion of their total weight being " adhesive."
The first railway carriages in England had four wheels with two axles, and this construction is still largely employed, especially for short-distance trains.
Later, when increased length became desirable, six wheels with Passenger g g three axles came into use; vehicles of this kind were carria es.
The majority of the wagons referred to above are comparatively short, are carried on four wheels, and are often made of wood.
American cars, on the other hand, have long bodies mounted on two swivelling bogie-trucks of four wheels each, and are commonly constructed of steel.
The ox-carts are often made with solid wheels, for greater strength.
Among the manufactures are charcoal, pig-iron, car wheels and general castings at Lime Rock, cutlery at Lakeville, and knife-handles and rubber brushes at Salisbury.
These have two wheels of 81 to 9 ft.
The most important manufactures are iron and steel, carriage hardware, electrical supplies, bridges, boilers, engines, car wheels, sewing machines, printing presses, agricultural implements, and various other commodities made wholly or chiefly from iron and steel.
Besides the ordinary shell money, there is a sort of stone coinage, consisting of huge calcite or limestone discs or wheels from 6 in.
Amasia has extensive orchards and fruit gardens still, as in Ibn Batuta's time, irrigated by water wheels turned by the current of the river; and there are steam flourmills.
These are long frames on four wheels, with a series of seats like a section of a theatre gallery.
The spindles of cutting wheels are driven by steam or electric power.
The wheels for making deep cuts are made of iron, and are fed with sand and water.
The wheels range in diameter from 18 in.
Wheels of carborundum are also used.
Wheels of fine sandstone fed with water are used for making slighter cuts and for smoothing the rough surface left by the iron wheels.
Polishing is effected by wooden wheels fed with wet pumice-powder and rottenstone and by brushes fed with moistened putty-powder.
Engraving is a process of drawing on glass by means of small copper wheels.
The wheels range from 2 in.
The spindles to which the wheels are attached revolve in a lathe worked by a foot treadle.
These attachments, first invented by Jeremiah Howard, and described in the United States Patent Journal in 1858, are simply hydraulic rams fitted into the side or top caps of the mill, and pressing against the side or top brasses in such a manner as to allow the side or top roll to move away from the other rolls, while an accumulator, weighted to any desired extent, keeps a constant pressure on each of the rams. An objection to the top cap arrangement is, that if the volume or feed is large enough to lift the top roll from the cane roll, it will simultaneously lift it from the megass roll, so that the megass will not be as well pressed as it ought to be;' and an objection to the side cap arrangement on the megass roll as well as to the top cap arrangement is, that in case more canes are fed in at one end of the rolls than at the other, the roll will be pushed out farther at one end than at the other; and though it may thus avoid a breakdown of the rolls, it is apt, in so doing, to break the ends off the teeth of the crown wheels by putting them out of line with one another.
The water forced by the force-pump against the Pelton wheels returns by a waste-pipe to the tank, from which the force-pump takes it again.
Two wheels of unequal height are commonly fitted to the front of the beam.
In the wheeled plough some of the weight and downward pull due to its action on the ground is taken by the wheels; the sliding friction is thus to some extent converted into a rolling friction, and the draught is correspondingly diminished.
The weight of these implements necessitates some provision for turning them at the headlands, and this is supplied either by a bowl wheel, enabling the plough to be turned on one side, or by a pair of wheels cranked so that they can be raised by a lever when the plough is working.
In this form of plough the frame is mounted on three wheels, one of which runs on the land, and the other two in the furrow.
The furrow wheels are placed on inclined axles, the plough beam being carried on swing links, operated by a hand lever when it is necessary to raise the plough out of the furrow.
This consists of a cast-iron pan having a shallow cylindrical bottom holding mercury, in which a wooden muller, nearly of the same shape as the inside of the pan, and armed below with several projecting blades, is made to revolve by gearing wheels.
These screws are turned from the eye-end by bevelled wheels and pinions, the latter connected with the handles a', b'.
The screw, turned by the wheels at g', acts in a toothed arc, whence, as shown in the figure, equal and opposite motion is communicated to the slides by the jointed rods v, v.
This ring runs between friction wheels and is provided with teeth on its inner periphery, and these teeth transmit motion to a pinion on a spindle having at its other end another pinion which, through an intermediate wheel, rotates the heliometer tube.
Another class of percussive coal-cutters of American origin is represented by the Harrison, Sullivan and Ingersoll-Sergeant machines, which are essentially large rock-drills without turning gear for the cutting tool, and mounted upon a pair of wheels placed so as to allow the tool to work on a forward slope.
Two equal sprocket wheels Q 1, Q 2, are fastened, the one to the spring pulley, the other to the shaft.
Queen Mary, unshaken in her attachment to the ancient faith and the papal monarchy, was able with the sanction of a subservient parlia ment to turn back the wheels of ecclesiastical legis lation, to restore the old religion, and to reunite the 1558.
Tilt of sights in field guns owing to the sinking of one wheel had long been recognized as a source of error, and allowed for by a rule-of-thumb correction, depending on the fact that the track of the wheels of British field artillery gun-carriages is 60", so that, for every inch one wheel is lower than the other, the whole system is turned through one degree - a_ hXl ?
The pattern is that of a true sight, that is to say, the base plate is capable of movement about two axes, one parallel to and the other at right angles to the axis of the gun, and has cross spirit-levels and a graduated elevating drum and independent deflection scale, so that compensation for level of wheels can be given and quadrant elevation.
The parts of the range of moulds are brought tightly together and held in position by the bars 0 and the screw P, and when one mould is filled the carrier is moved forward on its rails by wheels worked by a handle also shown in the figure.
The contents are poured by hand into moulds which are contained side by side in an iron carriage running on wheels, fig.
The power is usually transmitted through toothed wheels, each roll being driven independently in some cases, while sometimes power is applied to the lower roll only, the upper roll being coupled to it.
The coins are then gripped by a pair of india-rubber driving wheels, which force them past the rim of a thin disk with notches in its edge to fit the coins.
To this are fixed the bearings of the running wheels, fourteen on each side.
There is a dorsal interruption to the disk, in volving both trochus and cingulum and groove in this case the two halves of the disk may be developed in lobes, flower-shaped in Melicerta ringens, but often rounded and projecting like kettledrums. These give a strong impression of two crown wheels revolving in the same sense.
During this time the illusion of a wheel or wheels produced by the ciliary action of the disk had puzzled all observers.
The distortion which rails undergo in manufacture and use is incomparably less than that to which rivets are subjected, and thus rail steel may safely be much richer in carbon and hence in cementite, and therefore much stronger and harder, so as to better endure the load and the abrasion of the passing wheels.
Indeed, its carbon-content is made small quite as much because of the violence of the shocks from these wheels as because of any actual distortion to be expected, since, within limits, as the 1 0 20 24 2 32 30 4.0 4.3 4.
The annealing of such iron may occur in either of two degrees - a small one, as in making common chilled cast iron objects, such as railway car wheels, or a great one, as in making malleable cast iron.
It is used extensively for objects which require both hardness and ductility, such as rock-crushing machinery, railway crossings, mine-car wheels and safes.
Yet this very fact that it is unalterably hard has limited its use, because of the great difficulty of cutting it to shape, which has in general to be done with emery wheels instead of the usual iron-cutting tools.
There are two distinct ways of making the steel objects actually used in the arts, such as rails, gear wheels, guns, beams, &c., out of the molten steel made by the Bessemer, open hearth, or crucible process, or in an electric furnace.
Subsequently the hard top hairs are taken out as in the case of otters and beavers and the whole thoroughly cleaned in the revolving drums. The close underwool, which is of a slightly wavy nature and mostly of a pale drab colour, is then dyed by repeated applications of a rich dark brown colour, one coat after another, each being allowed to thoroughly dry before the next is put on, till the effect is almost a lustrous black on the top. The whole is again put through the cleaning process and evenly reduced in thickness by revolving emery wheels, and eventually finished off in the palest buff colour.
South Framingham has large manufactories of paper tags, shoes, boilers, carriage wheels and leather board; formerly straw braid and bonnets were the principal manufactures.
The actual efficiency of these wheels when used with high falls is from 80 to 86%; when used in connexion with high-pressure water in London an efficiency 1 This engine was fully described in Engineering, vol.
Pelton wheels are very sensitive to variation of load, and considerable trouble was experienced at first in securing adequate A s has now become one of 5.
Each pair of wheels is built in three storeys, and the outflow of the water is controlled by a cylindrical gate or sluice, which is moved up and down by the action of the governor.
The total upward pressure on this piston is calculated to be equal to 150,000 lb; hence the shaft-bearings are practically relieved from pressure when the wheels are running.
The total power developed is 600 H.P., and though the load factor varies very greatly in this case, the differential type of governor used secures perfect control of the running of the wheels.
Kingston's principal manufactures are tobacco, cigars and cigarettes, street railway cars and boats; other manufactures are Rosendale cement, bricks, shirts, lace curtains, brushes, motor wheels, sash and blinds.
For this mischievous and immoral alliance, which bound Denmark to the wheels of the Russian empress's chariot and sought to interfere in the internal affairs of a neighbouring state, Bernstorff was scarcely responsible, for the preliminaries had been definitely settled in his uncle's time and he merely concluded them.
Corn is threshed by a norag, a machine resembling a chair, which moves on small iron wheels or thin circular plates fixed to axle-trees, and is drawn in a circle by oxen.
This was an ancient trade route with the Sudan, and had been used without difficulty by the reinforcements sent to Hicks Pasha in 1883, whic,h were accompanied by guns on wheels.
The Greek chariot had two wheels, and was made to be drawn by two horses; if a third or, more commonly, two reserve horses were added, they were attached on each side of the main pair by a single trace fastened to the front of the chariot, as may be seen on two prize vases in the British Museum from the Panathenaic games at Athens.
The wheels and body of the chariot were usually of wood, strengthened in places with bronze or iron; the wheels had from four to eight spokes and tires of bronze or iron.
Among the Persians, again, and more remarkably among the ancient Britons, there was a class of chariot having the wheels mounted with sharp, sickle-shaped blades, which cut to pieces whatever came in their way.
The biga itself consists of a seat resting on the axle, with a rail at each side to protect the driver from the wheels.
The Power Was Transmitted To The Paddles By Bevel Wheels F, G, Rotating A Spindle Passing Through A Stuffing Box In The Bottom Of The Calorimeter.
Turning pieces in rolling contact are called smooth or toothless wheels.
Cylindrical Wheels and Smooth Racks.In designing cylindrical wheels and smooth racks, and determining their comparati* motion, it is sufficient to consider a section of the pair of pieces made by a plane perpendicular to the axis or axes.
The points where axes intersect the plane of section are called centres; the point where the line of contact intersects it, the poini of contact, or pitch-point; and the wheels are described as circular, elliptical, &c., according to the forms of their sections made by that plane.
When the point of contact of two wheels lies between theim centres, they are said to be in outside gearing; when beyond theii centres, ip inside gearing, because the rolling surface of the larger wheel must in this case be turned inward or towards its centre.
For otitside gearing that ratio is negative, Cs because the wheels turn contrary ways; for inside gearing it is positive, because they turn the same way.
If the velocity ratio is to be -constant, as in, fYi Williss Class A, the wheels must be circular; and this is the most common form for wheels.
If the velocity ratio is to be variable, as in s Williss Class B, the figures of the wheels are a pair of rolling curves, subject to the condition that the distance between their poles (which are the centres of rotation) shall be constant.
When the velocity ratio is variable, the line of contact will shift its position in the plane C1OC2, and the wheels will be cones, with eccentric or irregular bases.
In skew-bevel wheels the properties of a line of connection are not possessed by every line traversing the line of contact, but only by every line traversing the line of contact at right angles.
One of those consists in forming the rim of each wheel into a series of alternate ridges and grooves parallel to the plane of rotation; it is applicable to cylindrical and bevel wheels, but not to skew-bevel wheels.
Grooved wheels have hitherto been but little used.
The pitch-surfaces of a pair of toothed wheels are the ideal smooth surfaces which would have the same comparative motion by rolling contact that the actual wheels have by the sliding contact of their teeth.
The pitch-circles of a pair of circular toothed wheels are sections of their pitch-surfaces, made for spur-wheels (that is, for wheels whose axes are parallel) by a plane at right angles to the axes, and for bevel wheels by a sphere described about the common apex.
For a pair of skew-bevel wheels the pitch-circles are a pair of contiguous rectangular sections of the pitch-surfaces.
In wheels which rotate continuously for one revolution or more, it is obviously necessary that the pitch should be an aliquot part of the circumference.
In wheels which reciprocate without performing a complete revolution this condition is not necessary.
Such wheels are called sectors.
In order that a pair of wheels, or a wheel and a rack, may work correctly together, it is in all cases essential that the pitch should be the same in each.
Hence, in any pair of circular wheels which work together, the numbers of teeth in a complete circumference are directly as the radii and inversely as the angular velocities.
Hence also, in any pair of circular wheels which rotate continuously for one revolution or more, the ratio of the numbers of teeth and its reciprocal the angular velocity ratio must be expressible in whole numbers.
Let n, N be the respective numbers of teeth in a pair of wheels, N being the greater.
They there fore study that the numbers of teeth in each pair of wheels whici work together shall either be prime to each other, or shall hav their greatest common divisor as small as is consistent with velocity ratio suited for the purposes of the machine.
Thus the relative motion of the wheels is unchanged; but I is considered as fixed, and 2 has the total motion, that is, a rotation about the instantaneous axis I, with the angular velocity cii+a1.
Consequently, one of the forms suitable for the teeth of wheels is the involute of a circle; and the obliquity of the action of such teeth is the angle whose cosine is the ratio of the radius of their base-circle to that of the pitch-circle of the wheel.
Any other convenient figure may be assumed for the path of contact, and the corresponding forms of the teeth found by determining what curves a point T, moving along the assumed path of contact, will trace on two disks rotating round the centres of the wheels with angular velocities bearing that relation to the component velocity of T along TI, which is given by Principle II.
This method of finding the forms of the teeth of wheels forms the subject of an elaborate and most interesting treatise by Edward Sang.
All wheels having teeth of the same pitch, traced from the same path of contact, work correctly together, and are said to belong to the same set.
If the same rolling curve and tracing-point be used to trace both the faces and the flanks of the teeth of a number of wheels of different sizes but of the same pitch, all those wheels will work correctly together, and will form a set.
The teeth of wheels of any figure, as well as of circular wheels, may be traced by rolling curves on their pitch-surfaces; and all teeth of the same pitch, traced by the same rolling curve with the same tracing-point, will work together correctly if their pitchsurfaces are in rolling contact.
Trundles having only six staves will work with large wheels.
Backs of Teeth and Spaces.Toothed wheels being in general intended to rotate either way, the backs of the teeth are made similar to the fronts.
Perpendicular to 01 draw A1IA2, cutting the axe8 in Ai, A2 make the outer rims of the patterns and of the wheels portions of the cones A1B1I, A,B2I, of which the narrow zones occupied by the teeth will be sufficiently near to a spherical surface described about 0 for practical purposes.
Hookes wheels with oblique or helical teeth are in fact screws of many threads, and of large diameters as compared with their lengths.
Coupling of Parallel Axes.Two or more parallel shafts (such as those of a locomotive engine, with two or more pairs of driving wheels) are made to rotate with constantly equal angular velocities by having equal cranks, which are maintained parallel by a coupling-rod of such a length that the line of c000exion is equal to the distance between the axes.
Let the axis Ai carry a wheel of N1 teeth, driving a wheel of ni teeth on the axis Ai, which carries also a wheel of N2 teeth, driving a wheel of 113 teeth on the axis A3, and so on; the numbers of teeth in drivers being denoted by Ns, and in followers by ns, and the axes to which the wheels are fixed being denoted by numbers.
Supposing all the wheels to be in outside gearing, then, as each elementary combination reverses the direction of rotation, and as the number of elementary combinations m 1 is one less than the number of axes rn it is evident that if m is odd the direction of rotation is preserved, and if even reversed.
It is often a question of importance to determine the number of teeth in a train of wheels best suited for giving a determinate velocity ratio to two axes.
Let B/C be the velocity ratio required, reduced to its least terms, and let B be greater than C. If B/C is not greater than 6, and C lies between the prescribed minimum number of teeth (which may be called t) and its double 2t, then one pair of wheels will answer the purpose, and B and C will themselves be the numbers required.
Epicyclic Trains.The term ep-icyclic train is used by Willis to denote a train of wheels carried by an arm, and having certain rotations relatively to that arm, which itself rotates.
The arm may either be driven by the wheels or assist in driving them.
A pair of spur wheels in gear is an example of a higher pair, because the wheels have contact between their teeth along lines only.
The virtual centres 0,-,, O,i are at the respective axes of the wheels r and 1, and the centre O,-i divides the line through these two points externally in the ratio of the train of wheels.
Friction of Teeth.Let N be the normal pressure exerted between a pair of teeth of a pair of wheels; s the total distance through which they slide upon each other; n the number Of pairs of teeth which pass the plane of axis in a unit of time; then nf NI (63)
In the case of locomotives the balance weights required to balance the pistons are added as revolving weights to the crank shaft system, and in fact are generally combined with the weights required to balance the revolving system so as to form one weight, the counterpoise referred to in the preceding section, which is seen between the spokes of the wheels of a locomotive.
To make the department pay, the machines must be kept fully employed with the many classes of work that a large concern has to deal with; the wheels must be kept running as much as possible, and the time for making-ready curtailed as far as is consistent with the proper preparation of the forme.
Huygens (Descriptio automati planetarii, 1703) uses the simple continued fraction for the purpose of approximation when designing the toothed wheels of his Planetarium.
On wing the movements of the condor, as it wheels in majestic circles, are remarkably graceful.
About a mile west of the town are the curious sea mills; a stream of sea water running down a chasm in the shore is made to turn the wheels.
Some earlier stories, such as The Wheels of Chance (1896) and Love and Mr Lewisham (1900), had proved his talent for drawing character, and pure phantasies like The War of the Worlds (1898) his abundant invention; but Kipps (1905) and Tono-Bungay (1909) showed a great advance in artistic power.
The rainbow-like circular wheels are the propellers, answering to the wheels of a steam-boat, and acting upon the air after the manner of a windmill.
These wheels receive motions from bands and pulleys from a steam or other engine contained in the car.
It was furnished with four strong flanged wheels and ran along a light broad-gauge (9 ft.) railway track, 1800 ft.
When the machine had travelled only a few hundred feet, all four of the small outrigger wheels were fully engaged, which showed that the machine was lifting at least 8000 lb.
Steam had already been shut off, and the machine coming to rest fell directly to the ground, all four of its wheels sinking deeply into the turf without leaving other marks.
Before making this run the wheels which were to engage the upper track were painted, and the paint left by them on the upper track indicated the exact point where the machine lifted.
The machine was furnished with two wheels and vertical supports which depended from the anterior parts of the aeroplanes and supported it when it touched the ground FIG.
If now a small weight, as a penny, be passed through the slot, H, it falls into the small box, I, and causes the lever, J, to turn; the lever, J, which turns in friction wheels at K, and is counterbalanced at 0, carries a toothed segment, L, which actuates a small pinion on the same axle as F, and is free to turn on that axle by a sleeve.
Since so small a weight as a penny has to move the lever, J, together with the dial finger, &c., it is evident that the workmanship must be good and the friction kept very low by means of friction wheels.
A useful application of weighbridges is to ascertain the exact weights on the separate wheels of locomotive engines, so that they may be properly adjusted.
The engine is moved on to them, and the pressures of all the wheels are taken simultaneously, each by its own weighbridge.
Behind the pulley at the top of the machine and on the same shaft is a spur wheel, which drives both of the spur wheels shown in the diagram.
When the poise is at the zero end, and there is no load on the platform, the end of the steelyard is down, and has locked the ratchet wheel by means of the pawl; the shaft being thus locked, the sprocket wheels are stopped, the drum-shaft runs free by the friction clutch, and the two pulleys which are connected by the crossed band are running idle.
The mitre wheels come into operation and the poise is carried along till the end of the steelyard drops, and locks the ratchet by permission of the Controller of wheel.
Consequently the motion of the mitre wheels is reversed and the poise is run back to zero.
The poise having arrived at the end of its run and unable to go further, the mitre wheels and the sprocket gearing are stopped, and the two pulleys and the cross belt run idle till the.
A spur pinion D, gearing with both wheels, is carried loosely upon an eccentric E forming part of the central pin, so that when this latter is turned by the hand-wheel F and chain G the axis of the pinion describes a circle the diameter of which equals the throw of the eccentric, and a small relative motion of the two sheaves takes place, depending on the number of the teeth of the annular wheels.
The ratchet communicates with a train of wheels which work the dial-hands.
Other Greek statesmen, and notably Tricoupis, had worked for a Balkan League but failed, partly, no doubt, owing to adverse circumstances, but partly also because of Greek unpreparedness for war and of the inflexibility of the Greek claims. Venizelos was, it is true, favoured by circumstances - the Balkan races just then had been drawn together in self-defence against the newly fledged tyranny of the Young Turks in Macedonia and Thrace, while the military revolt of 1909 had swept the Greek political stage clear of nearly all the corrupt parties, that hitherto had blocked the wheels of the nation's progress.
Wheeled carts were also known; the wheels were often probably only solid disks, though spoked wheels were used for chariots.
At first he devoted himself to mathematical and astronomical studies; his Cosmotheoria (1528) records a determination of a degree of the meridian, which he made by counting the revolutions of his carriage wheels on a journey between Paris and Amiens.
In most cases such wheels merely have earthenware pitchers attached to their circumference by means of wisps of esparto, and are turned by a horse harnessed to a long arm fitted to a revolving shaft.
In other fine adjustments by means of springs and balance wheels either a micrometer screw is moved (Zeiss), or a curved disk fixed to the balance wheel is turned (Leitz), or an oblique disk arranged more or less in a circle and attached to the balance wheel is revolved (Reichert).
I knew I needed medical assistance beyond the temporary first aid I applied in my home on wheels.
Her mental wheels began to move again as she grappled with not only what he'd done, but why Andre and Gabriel â€“ who knew the truth long before she did â€“ chose now to have it revealed to her.
The first sign of the ground Dean spotted was a rain puddle reflecting the glow from the lights of the plane as the wheels touched the runwayâ€”one, two, three times before the tired aircraft glided to the taxiway.
After doing some stretching exercises and setting his bike's trip odometer, he began, slowly at first, to swing into his rhythmic cadence of 70 revs per minute, maintaining the pace by shifting gears as the country hills rolled beneath his wheels.
We settled for improving last years car by converting to 16 " wheels with covers, improving the aerodynamics & fixing the gears.
However, if you ride a super-lightweight bike, with carbon-fibre wheels, you should seriously consider carrying a small anvil in your pannier.
Wheels, rear axle and pedals all run on sealed ball bearings.
To grease the wheels for change, the director for retail banking threw his support behind the initiative.
The car lurches around hairpin bends, its wheels inches from the edge.
Another recently acquired customer is World Wheels, which specializes in selling Dahon folding bicycles.
Even more mysteriously, the train thought to have hit the man has no bloodstains on the wheels.
The eighth and ninth vehicles derailed rear bogie only and the following vehicles derailed all wheels.
Using two lamps, two color wheels and dual illumination channeling, the F3 achieves up to 5500 ANSI lumens brightness on screen.
And good-night, Watson, " he added, as the wheels of the royal brougham rolled down the street.
They are made with a camber adjuster so the wheel camber can be accurately adjusted once the trike is on its ' wheels.
The table is attached to a stand complete with lockable casters (wheels ).
Catherine wheels spinning from the tower itself.
Wheels on fire The passion of national rally champ Richard Mason.
Working with old bicycle wheels and broken china, our mosaic making workshops are great examples of recycling materials.
Aircraft that require hand starting by prop swinging must have chocks placed in front of the wheels.
Otherwise, indigenous peoples will continue to be mere cogs in the wheels of these billion-dollar industries.
Whether keeping accounting records or running the company payroll, accountants are essential cogs in the wheels of industry.
Consider the use of low ground pressure tires, dual wheels or tracked vehicles to minimize soil compaction.
Girls purple bike, 24 " wheels, 18 gears, ex con, suit ages 8 - 12 years. £ 30.
The wheels of screw conveyor were made of PVC.
The floor covering should allow the wheels of the chair to move freely.
Everything you could need for two wheels, with a single-minded dedication to provide the best possible customer service.
The first three wagons of the freight train each had their leading pair of wheels derailed.
They stripped it during the afternoon and found the planet wheels had seized onto the shaft, effectively locking the diff!
It must have looked distinctive with the bodywork and wheels painted blue and the interior trimmed with matching leather.
When on two wheels, keep it at 15 mph to stay in a nice donut on two wheels.
To all four wheels actor Douglas henshall in a vacuum.
The replaced Samsons had smaller 6ft driving wheels and were thus colloquially known as the ' Small Jumbos ' .
The were basically similar to the ' Large Bloomer ' but had smaller boiler and smaller driving wheels 6ft 6in, instead of 7ft.
Rail privatization was once dubbed poll tax on wheels.
A chassis dynamometer is used to measure the power transferred by the drive wheels onto the dynamometer's rollers.
They had 16 " x 24 " cylinders, 6ft diameter driving wheels, domeless boilers and raised firebox.
The launch of wheels forklift truck Mobilevision signals the impending Industries arrival of several major sports brands to the mobile video medium.
A long handled hammer was all that was needed to detect wheels with hairline fractures.
Power is transmitted through the super direct 6-speed gearbox to the rear wheels.
To better camouflage urban grime, the Lightning CityX features Villain Black cast aluminum wheels and a Midnight Black chin fairing and front fender.
I've got to 40, and now I'll be spending the second half of my life with wheels instead of legs.
You will also avoid the hassle of securing your wheels, every time you lock your bike up.
The car sits up high on 13 inch wheels.
Sealed bearing mechanism and solid disk wheels with chrome hubcaps.
Big Ole Bike Bash Had a nasty knock on two wheels?
A target was erected and the Page would mount a wooden ' horse ' on wheels holding a lance.
Two wheels for interchangeable dichroic color and gobo selections, and three available lenses make the luminaire completely user-configurable.
Specific projects have included thermoacoustic refrigeration, automotive wheels and tires, bioengineering applications, robotic manipulators, washing machines and MRI scanners.
Wagon Wheels S A large circular marshmallow and cookie snack covered in chocolate.
Figures 6 and 7 show higher magnification micrographs of hardmetal samples tested with wet rubber, dry rubber and wet steel test wheels.
We recommend that wheels are washed using a microfibre wash mitt and a gentle shampoo in conjunction with the two bucket method.
The Saturn Aura's profile is intended to convey a muscular stance with the wheels pushed to the corners creating short overhangs.
Carriage bogie overhauls continued, along with the fitting of new wheels to replace those with casting defects.
The wheels were dropped after takeoff and on the DFS-230 type B we had a braking parachute.
Gold-tone metal necklace with vintage motor car pendant in bright red with gray and orange spoked wheels.
These include the picnic on Wheels which allows cyclists to stop by the river for a picnic in the surroundings of Seaclose Park.
So I turned around and could only see an old pram with no wheels left by someone to go rusty in the open air.
Fortunately he had recently come across a couple of old wheels together with fairly presentable tires, at a breaker's yard.
The pulley wheels attach to pulley wheels attach to pulley stiles - the upright sides of the frame which hide the weights.
Activities from Inventor's Workshop link directly to the teaching of wheels and axles, gears, pulleys and cams.
Typical of a vintage model, the legs are steeply raked forward, bringing the wheels a long way forward of the balance point.
A horizontal steering wheel Miniature steering wheels are for people who have little strength or very restricted movement.
Projects Classic Reels on Wheels Each year, the Archive organizes a major film roadshow, Classic Reels on Wheels.
The coupling rods were then fitted back on the wheels.
It has 5 inch wheels with a recommended maximum rider weight of... and has a rounder more ankle friendly edge.
For example, explain to me how they could fake the dust off the wheels of the lunar rover.
Crews use signboards or small gunpowder charges detonated by an oncoming train's front wheels to warn of blockages ahead.
The single bar handle and in-line skate wheels make it easy to use and stable on the ground.
Riding down the mountain on an oversized skateboard with beefy wheels and trucks.
Locking Wheel skewers replace the quick release skewers fitted to many bike wheels to prevent the wheels being stolen.
But it's fun and keeps the wheels spinning.
But the cotton could not be spun quickly enough in the domestic system by hand-spinners using spinning wheels.
The Trophy has a reworked VVC engine producing 158bhp and is distinguishable by 16 alloy wheels, front bib splitter and boot spoiler.
The wheel magnet attaches to conventional three crossed spoke pattern wheels, bladed or radial spokes may require an alternate spoke magnet.
Both wheels were rebuilt with stainless spokes by Brian Parsons of Fleet, Hampshire.
Large sliding cabin doors; retractable undercarriage, with the main wheels housed in small sponsons.
Colonel Stevens, an American, built a small steamboat with a propeller or " screw " for propulsion instead of paddle wheels.
Optional equipment includes attractive polished wood center console plus, for the first time, classically stylish 18 ' ' wire wheels.
The ELX gains climate control, alloy wheels, twin electric sunroofs and folding door mirrors.
Optional extras include Hellfire missiles, chain gun, tilt and slide sunroof, alloys wheels and power assisted steering.
At that very moment the wheels of the plane hit the tarmac with a bang causing the suitcase lid to slam shut once more.
Today there are three water wheels driving large tilt hammers and grindstones.
Its solid, hooked tines cut through the toughest thatch and the wheels keep it at a constant level.
Values through car churchill insurance wheels zero tolerance ' ago mainly relying.
The fully automatic 4WD transmission regulates traction on the four wheels from 0 to 100% according to grip.
If wheels don't do it for you then why not try aerial trapeze.
Color coordinated door mirrors, contrasting chrome door handles and roof rack with rather trendy wheels add the finishing touches.
Three wheels, for example, makes a tricycle or trike.
It hauled tubs of ore to the crushing mill while other wheels worked the crushing machines, jiggers, buddles and separators.
Examine areas where water splash from both the trailer and the towing vehicle wheels would strike the underside of the trailer.
Other modifications to wheels, tires and suspension can also make an already firm ride downright unpleasant.
For this reason, we recommend switching to a microfibre wash mitt when wash mitt when washing wheels and the insides of wheel arches.
At first these were called mills, as they were built beside streams and had water wheels to drive the machinery.
Brakes are disk and work on the rear wheels.
It jumped the curb just opposite the Bath Abbey, spinning wheels across stone.
The spoked aluminum wheels are a classic enduro feature.
It features front lockable swivel wheels, comfortable foam padded handle and two detachable hoods.
The front wheels can either swivel or be fixed.
Coupling Rod These couple driving wheels of the same size together to spread the tractive effort over the coupled wheelbase.
The third pair of driving wheels had no flanges, to assist the long rigid wheelbase get round sharp curves.
Features include realistic styling, racy stickers, large, durable wheels and a wide wheelbase that is designed for stability.
Camber on the front wheels can be set using the adjustable link on the upper wishbone.
The pinion z and the toothed wheel d are connected by an intermediate wheel and pinion Y; the numbers of teeth in the wheels and pinions are so proportioned that twenty-four revolutions of the micrometer screw produce one revolution of the drum and wheel d.
The cries of animals are but the working of the curiously-contrived machine, in which, when one portion is touched in a certain way, the wheels and springs concealed in the interior perform their work, and, it may be, a note supposed to express joy or pain is evolved; but there is no consciousness or feeling.
Out of the north (the Babylonian sacred mountain) comes a bright cloud, wherein appear four Creatures (formed on the model of Babylonian composite figures), each with four faces (man, lion, bull, eagle) and attended by a wheel; the wheels are full of eyes, and move straight forward, impelled by the spirit dwelling in the Creatures (the spirit of Yahweh).
With the exception of a few special cranes in which friction wheels are employed, it is universally the practice, in steam cranes, to connect the engine shaft with the barrel shaft by spur toothed gearing, the gear being connected or disconnected by sliding pinions.
The latter consists of a framework carrying the hoisting barrel, with its driving motor and gearing, and a travelling motor, which is geared to the running wheels in such a manner as to be able to propel the whole machine; FIG.
Richard Trevithick, indeed, had in 1804 tried a high-pressure steam locomotive, with smooth wheels, on a plate-way near Merthyr Tydvil, but it was found more expensive than horses; John Blenkinsop in 1811 patented an engine with cogged wheel and rack-rail which was used, with commercial success, to convey coal from his Middleton colliery to Leeds; William Hedley in 1813 built two locomotives - Puffing Billy and Wylam Dilly - for hauling coal from Wylam Colliery, near Newcastle; and in the following year George Stephenson's first engine, the Blucher, drew a train of eight loaded wagons, weighing 30 tons, at a speed of 4 m.
If this pressure is not relieved in some way, the train may be derailed either (I) by " climbing " the outer rail, with injury to that rail and, generally, to the corresponding wheel-flanges; (2) by overturning about the outer rail as a hinge, possibly without injury to rails or wheels; or (3) by forcing the outer rail outwards, occasionally to the extent of shearing the spikes that hold it down at the curve, thus spreading or destroying the track.
If it is an engine, particular attention must be directed to the type, weight, arrangement of wheels and height of centre of gravity above rail level.
It is also resisted in part by the conicity of the wheels, which converts the lateral force partly into a vertical force, thus enabling gravity to exert a.
The torque corresponding to this couple is F 1 X z D = 2µWID, and hence follows the fundamental relation, 2T = 2F 1 D = 2µWID, or if W now represents the weight supported by the axle, F will be the tractive force exerted on the frame by the two axle-boxes to propel the vehicle, and the more convenient relation is established, T=2FD=2µWD (3) If T has a greater value than this relation justifies the wheels will slip. F is called the " tractive force " at the rail.
The most usual way of providing this power is by the combustion of coal in the fire-box of a boiler and the utilization of the steam produced in a steam-engine, both boiler and engine being carried on a frame mounted on wheels in such a way that the crank-shaft of the steam-engine becomes the driving-axle of the train.
From equation (3) it is clear that the wheels of the driving-axle must be heavily loaded in order that F may have a value sufficiently great to propel the train.
The wheels are coupled, but the feature of the engine is that the couplingrods act merely to keep the high-pressure and low-pressure engines in phase with one another, very little demand being made upon them to transmit force except when one of the wheels begins to slip. In this arrangement the whole of the adhesive weight of the engine is used in the best possible manner, and the driving of the train is practically equally divided between two axles.
A tender is generally mounted on six wheels, or in some cases on two bogies, and carries a larger supply of water and fuel than can be carried by tanks and the bunker of a tank engine.
In the case where either the leading or trailing group of small wheels is absent the numeral o must be used in the series of three numbers used in the description.
Both load and speed have increased so much in connexion with passenger trains that it is necessary to divide the weight required for adhesion between three-coupled axles, and the type of engine gradually coming into use in England for heavy express traffic is a six-coupled engine with a leading bogie, with wheels which would have been considered small a few years ago for the speed at which the engine runs.
The principal of these trades are the weaving of carpets - about Tyumen; the making of wire sieves; the painting of ikons or sacred images; the making of wooden vessels and of the necessaries for the carrying trade about Tomsk (sledges, wheels, &c).; 2 Russian Encyclopaedic Dictionary, vol.
The abrasion is effected by pressing the glass against the edge of wheels, or disks, of hard material revolving on horizontal spindles.
These are received upon a railway made of two strips of angle iron of the proper gauge for the wheels, and are locked fast by a latch falling over their ends.
Savart's toothed wheel apparatus, named alter Felix Savart (1791-1841), a French physicist and surgeon, consists of a brass wheel, whose edge is divided into a number of equal projecting teeth distributed uniformly over the circumference, and which is capable of rapid rotation about an axis perpendicular to its plane and passing through its centre, by means of a series of multiplying wheels, the last of which is turned round by the hand.
Now, suppose that the note produced with Savart's apparatus is in unison with A3, when the experimenter turns round the first wheel at the rate of 60 turns per minute or one per second, and that the circumferences of the various multiplying wheels are such that the rate of revolution of the toothed wheel is thereby increased 44 times, then the latter wheel will perform 44 revolutions in a, second,.
For the horse-drawn rake, a bar with long curved steel teeth is mounted on wheels (see HAY AND Haymaking).
The teeth of a rack, to work correctly with wheels having involute teeth, should have plane surfaces perpendicular to the line of connection, and consequently making with the direction of motion of the rack angles equal to the complement of the obliquity of action.
Behind the wings are two vertical fan wheels, furnished with oblique vanes, which are intended to propel the apparatus through the air.
The Connecticut clock maker and clock peddler was the 18th-century embodiment of Yankee ingenuity; the most famous of the next generation of clock makers were Eli Terry (1772-1852), who made a great success of his wooden clocks; Chauncey Jerome, who first used brass wheels in 1837 and founded in 1844 the works of the New Haven Clock Co.; Gideon Roberts; and Terry's pupil and successor, Seth Thomas (1786-1859), who built the factory at Thomaston carried on by his son Seth Thomas (1816-1888).
At such times Dorothy, Zeb and the Wizard all pushed behind, and lifted the wheels over the roughest places; so they managed, by dint of hard work, to keep going.
After a great deal of tinkering and trying, they did succeed in making two paddle