Vibration sentence example
Suddenly, I felt a vibration in my back pocket!
Even with my cell phone on silent, the vibration was enough to distract me.
The sudden vibration of the floor in my office made me think an earthquake was happening.
The vibration of the washing machine made a terrible noise, making it difficult to concentrate.
When you turn up the bass in your car and play loud music, you will feel the vibration of the speakers.Advertisement
Every sound we hear is caused by vibration, either large or small.
The vibration of the ukelele strings soothed me with their mellow tune.
The various modes of vibration may also be exhibited.
I connect my love for science and music by thinking of the vibration waves that make beautiful sounds.
The principle of forced vibration may be illustrated by a simple case.Advertisement
In that case a sine wave type vibration did show up on the photographs.
The vibration of the air as the organ notes swelled made her sway in answer.
The type bed travels with a reciprocating motion upon rollers or runners made of steel, the bed being driven by a simple crank motion, starting and stopping without much noise or vibration.
Engine noise is well muffled and vibration can only really be felt through the gearstick.
In the case of normal mode vibration derived from a relaxation oscillation, we need low-frequency tuning of the attached oscillator.Advertisement
This, in turn, causes vibration of tiny bones in the middle ear (the ear ossicles ).
Depending on the test specification, vibration tests may be carried out on a single axis or three mutually perpendicular axes.
Using an optical technique for displacement measurement enables remote sensing of vibration.
The engine unit is exceptionally rigid, with vibration and noise reduced as much as possible.
Engine noise is minimal with only a slight and quite soporific vibration.Advertisement
These clamps are important as they suppress coil vibration transmitted from the engine.
The Vortex dampens the vibration caused by the rapidly spinning motors in the hard drive, reducing noise and shock.
The density relieving spheres within CMM dramatically damp vibration, offering a pure, soft feel.
The piezoelectric actuator can generate the bending moment to suppress unwanted flexural vibration induced by a sudden rotation of the motor hub.
Suppose, for distinctness of statement, that the primary ray is vertical, and that the plane of vibration is that of the meridian.Advertisement
If the primary ray is unpolarized, the light scattered north and south is entirely due to that component which vibrates east and west, and is therefore perfectly polarized, the direction of its vibration being also east and west.
Similarly any other ray scattered horizontally is perfectly polarized, and the vibration is performed in the horizontal plane.
Let the particle be at the origin of coordinates, and let the expression for the primary vibration be =sin (nt - kx).
Accordingly, if E be the energy of the primary wave, dE 87-2n (D' - D) 2 T2 E dx 3 D2%4 ' whence E = Eoe-hx (II) where h = 8?r 2 n (D' - D)2T2 3 D2 x 4, (12) If we had a sufficiently complete expression for the scattered light, we might investigate (12) somewhat more directly by considering the resultant of the primary vibration and of the secondary vibrations which travel in the same direction.
We learn that the light dispersed in the direction of primary vibration is not only of higher order in the difference of optical quality, but is also of order k 2 c 2 in comparison with that dispersed in other directions, where c is the radius of the sphere, and k=21r/X as before.
It is precisely defined by a vibration number recording the frequency of the pulsations of a tense string, a column of air, or other vibrator, in a second of time.
In Great Britain and America the complete vibration to and fro (swing both ways of a pendulum) is taken as the unit; elsewhere the vibration in one direction only (swing one way of the pendulum).
The vibration number stated in the edict establishing the Diapason Normal is 870 (435), which for comparison will be here adhered to.
The lower vibration number is justified by due consideration of the three divisions of the male voice, bass, tenor and alto, as given by Praetorius, whose Cammerton very closely corresponds with Bernhardt Schmidt's Durham organ, 1663-1668, the original pitch of which has been proved by Professor Armes to have been a 1 474.1.
Forks intended for this vibration number, stamped "Philharmonic," were sold as late as 1846.
The coefficient of this rise is equivalent to half a vibration (o.5) per degree Fahr.
Continuing his inquiries for the next year or two, he was able to discover the progressive propagation of electromagnetic action through space, to measure the length and velocity of electromagnetic waves, and to show that in the transverse nature of their vibration and their susceptibility to reflection, refraction and polarization they are in complete correspondence with the waves of light and heat.
If the rates of vibration of the two tuning-forks at the two stations could be maintained precisely the same, the two arms would rotate in synchronism, but as this uniform vibration cannot be exactly A / 4 3/ Line /‘ --- /4 -- ?
Should the rotating arms fail to pass over these correcting segments at their synchronous positions, correcting currents pass to a relay which cuts off momentarily the current actuating the tuning-fork, thereby altering the rate of vibration of the latter until the arms once more run together uniformly.
In the latter case, which is the standard practice, mechanical vibration of the siphon is substituted in the place of electrification of the ink, so as to eliminate the effect of atmospheric conditions which frequently caused discontinuity in the flow of ink.
Such a pendulum can be set in vigorous vibration even by feeble puffs of air directed against it, provided these are administered exactly in time with the natural period of vibration of the pendulum.
All tadpoles are provided with more or less distinct lines of muciferous sensory crypts or canals, which stand in immediate relation to the nerve branches and are regarded as organs of a special sense possessed by aquatic vertebrates, feeling, in its broadest sense, having been admitted as their possible use, and the function of determining waves of vibration in the aqueous medium having been suggested.
At whatever spot an insect becomes entangled in the frame, the vibration set up by its struggles is transmitted along the nearest radiating thread to the centre and thence up the trap line to the shelter where the occupant lurks awaiting the signal.
No sooner is the vibration perceived than the spider descends with all speed to the centre, and by feeling the ends of the radiating lines learns which is ashake and rapidly, without the possibility of mistake, makes its way to the entangled insect.
It differs from p by the presence of vibration of the vocal chords and from m because the nasal passage as well as the lips is closed.
If A is the moment of inertia of the magnet, and t the time of a complete vibration, MH = 41r 2 A/t 2 (torsion being neglected).
The galvanometer which is used for ballistic observations should have a somewhat heavy needle with a period of vibration of not less than five seconds, so that the transient current may have ceased before the swing has well begun; an instrument of the d'Arsonval form is recommended, not only because it is unaffected by outside magnetic influence, but also because the moving part can be instantly brought to rest by means of a short-circuit key, thus effecting a great saving of time when a series of observations is being made.
Ewing has also studied the effect of vibration in conferring upon iron an apparent or spurious permeability of high value; this effort also is most conspicuous when the magnetizing force is weak.
Ewing has himself also shown how satisfactorily this theory accords with many other obscure and complicated phenomena, such as those presented by coercive force, differences of magnetic quality, and the effects of vibration, temperature and stress; while as regards simplicity and freedom from arbitrary assumptions it leaves little to be desired.
Now the effect upon P of each element of the plane is proportional to its area; but it depends also upon the distance from P, and possibly upon the inclination of the secondary ray to the direction of vibration and to the wave-front.
Hence, in accordance with the rule for compounding vector quantities, the resultant vibration at B, due to any finite part of the primary wave, is represented in amplitude and phase by the chord joining the extremities of the corresponding arc (U2-0.1).
On the illuminated side, at a distance from the shadow, the vibration is represented by JJ'.
As the point under contemplation is supposed to approach the shadow, the vibration is represented by the chord drawn from J to a point on the other half of the curve, which travels inwards from J' towards 0.
If the ray be parallel to OX, and the direction of vibration parallel to OZ, we have E =o, 7 7 = o, while I is a function of x and t only.
Let 0 be any point in the medium situated at a distance from the point 0 1 which is large in comparison with the length of a wave; let O/O=r, and let this line make an angle 0 with the direction of propagation of the incident light, or the axis of x, and 4, with the direction of vibration, or axis of z.
If the direction of primary vibration be perpendicular to the plane of diffraction (containing both primary and secondary rays), sin 4, = I; but, if the primary vibration be in the plane of diffraction, sin 4, =cos 0.
This therefore expresses the secondary disturbance at a distance r and in a direction making an angle cp with OZ (the direction of primary vibration) due to the element dS of the wave-front.
The ellipsoid was the shape first worked out, by George Green, in his Research on the Vibration of a Pendulum in a Fluid Medium (2833); the extension to any other surface will form an important step in this subject.
The ringing of bells, building operations, vibration of machinery, fireworks, bands, a circus, merry-go-rounds, collecting disorderly crowds, dancing, singing, &c., have been held under certain circumstances to constitute nuisances so as to interfere with quiet and comfort, and have been restrained by injunction.
One form consists of a tuning-fork electrically maintained in vibration of known period, which closes an electric contact at every vibration and sets another electromagnet in operation, which reverses a switch and moves over one terminal of the condenser from a battery to a galvanometer contact.
The assumption usually made is that the total kinetic energy of the molecules, including possible energy of rotation or vibration if the molecules consist of more than one atom, is proportional to the energy of translation in the case of an ideal gas.
He found that his crystal-grating gave a spectrum of two lines for each element and that their frequency increased by definite steps ashepassed from one element to the next; indeed, the frequency of vibration associated with each element was a simple function of a number which he found to be identical with the atomic number.
Frahm,' during an important investigation on the torsional vibration of propeller shafts, measured the relative angular displacement of two flanges on a propeller shaft, selected as far apart as possible, by means of an electrical device (Engineering, 6th of February 1903).
As a step towards removing this difficulty we notice that the energy of a vibration such as is represented by a spectral line has the peculiarity of being unable to exist (so far as we know) without suffering dissipation into the ether.
On light Franklin wrote to David Rittenhouse in June 1784; the sum of his own conjectures was that the corpuscular theory of Newton was wrong, and that light was due to the vibration of an elastic aether.
Thus waves are propagated along OX, each wave consisting of one push and one pull, one wave emanating from each complete vibration to and fro of the source AB.
This is obvious if we consider that the greater the vibration of the source the greater is the excursion of the air in the issuing waves, and the louder is the sound heard.
Hence arises the same number of successive impulses of the external air immediately in contact with the movable plate, which is thus thrown into a state of vibration at the rate of n for every revolution of the plate.
Thus, if an elastic metal slip or a pig's bristle be attached to one prong of a tuningfork, and if the fork, while in vibration, is moved rapidly over a glass plate coated with lamp-black, the attached style touching the plate lightly, a wavy line will be traced on the plate answering to the vibrations to and fro of the FIG.
The same result will be ob tained with a stationary fork and a movable glass plate; and, if the time occupied by the plate in moving through a given distance can be ascertained and the number of complete undulations exhibited on the plate for that distance, which is evidently the number of vibrations of the fork in that time, is reckoned, we shall have determined the numerical vibration value of the note yielded by the fork.
Lissajous also obtained the figures by aid of the vibration microscope, an instrument which he invented.
This resonance is a particular example of the general principle that a vibrating system will be set in vibration by any periodic Forced VI force applied to it, and ultimately in the period of the force, its own natural vibrations gradually dying down.
For the vibration of air in other cavities than long cylindrical pipes we refer to Rayleigh's Sound, vol.
In order that the vibration may be maintained, a periodic force must be applied either to aid the internal restoring force on the return journey, or weaken it on the outgoing journey, or both.
In the organ pipe - as in the common whistle - a thin sheet of air is forced through a narrow slit at the bottom of the embouchure and impinges against the top edge, which is made very p c. sharp. The disturbance made at the commencement of the blowing will no doubt set the air in the pipe vibrating in its own natural period, just as any irregular air disturbance will set a suspended body swinging in its natural period, but we are to consider how the vibration is maintained when once set going.
And what is true for the extreme points is true for the half periods of which they are the middle points; that is, heat given during the compression half aids the vibration, and during the extension half damps it.
The most striking conclusions from the results are that the locomotive balance weights have a large effect in causing vibration, and next, that in certain cases the vibrations are cumulative, reaching a value greater than that due to any single impact action.
Hagen that for dark heat rays of only about ten times the wave-length of luminous radiation, the properties of metals are determined by their electric resistance alone, which then masks all resonance due to periods of free vibration of the molecules; and, moreover, that the resistance for such alternations is practically the same as the ohmic resistance for ordinary steady currents.
The sound quality is superb, tho the vibration of rumbling bass may not be to everyone 's taste.
The laser is scattered from a scaler tip during vibration analysis.
Both of these are detrimental to the self-adhesive backing of the vibration damping sheet.
This produces vibration data that may be animated or superimposed over scaler images.
This applies both to high speed low noise and to low speed tapered roller and spherical roller bearings subject to shock or vibration loads.
The cause of unwanted vibration To minimize vibration it is often recommended to match the tonearm effective mass to the stylus compliance.
Good action with twirling cane, mouth opens and closes, vibration causes the toy to move around on smooth surfaces.
This allows routine computation of undamped vibration of any linear structure, for example by Finite Element methods.
The time required for an undamped system to complete one cycle of free vibration is the natural period of vibration of the system.
Avoiding occupational exposure to cold or vibration Stopping any vasoconstrictor drugs (unless the risks of stopping outweigh the benefits).
A dynamic vibration absorber system was shown to be potentially relevant in respect of floor response in Base Isolated structures.
Engine acting as swingarm, coupled to frame by two linkages mounted on radial vibration dampers.
This includes respiratory problems from coal dust inhaled while they were working in mines and Vibration White Finger from using damaging vibratory tools.
Even with my cell phone on silent, the vibration was enough todistract me.
The vibration of the ukelele strings soothed me with theirmellowtune.
The Snuza will recognize if movement is not sensed, and will actually trigger a vibration if 15 seconds passes without movement, to stimulate baby to breathe.
The vibration feels similar to when you put your cell on silent, and someone tries to call you or send through a message.
If the Snuza does not sense movement within 5 seconds of the vibration, then an audible alarm is activated so that parents, grandparents or caregivers can check their baby and get appropriate medical assistance, if necessary.
The monitor's vibration will then alert the parents' to their child's cries.
If the racquet you purchase begins to vibrate a lot after use, be sure to go and buy vibration dampeners.
They also offer higher cold cranking amperage, faster recharging times and have better resistance to heat and vibration.
Graphite shafts offer better vibration absorption and they're easier to swing, so they're usually preferred by the average golfer whereas steel shafted clubs are typically the club of choice for the pros.
Other systems -- generally wireless ones -- provide warnings in the form of vibration or sound before the dog reaches the edge of the perimeter where she will receive a shock.
The PetSafe Wellness Bed for dogs and cats combines heat and vibration for an overall massaging effect.
This action causes the glottis to contract, and this in turn causes a vibration when the cat inhales and exhales.
It is fastened to a rooftop and has virtually no vibration.
Vibration dampeners absorb vibrations from a ski that makes it unstable at higher speeds.
Unblock your chakras by listening to a sound vibration session.
These sound vibration therapy sessions can be purchased on CD, and they can be played on any CD player.
An example of this sound vibration therapy is the ChiBliss system.
This method uses whole body vibration to help relieve stress, increase circulation, promote muscle strength, and improve flexibility.
PetSafe Wellness Beds combine the soothing effects of heat and vibration into massaging dog beds that may actually help pets regain some of the mobility they have already lost.
Vibration stimulation is useful for giving silent commands, lessening the chance of confusing your pet or other dogs training around him.
Pillar Palatal Implant System reduces the vibration in the soft palate by firming the area with implants.
By keeping the lower jaw in place, the airway space is increased, reducing the amount of soft tissue vibration and thus reducing, if not eliminating, the snoring.
This vibration is what produces the sound associated with snoring.
The machine adjusts automatically, using vibration sensors to monitor the patient's breathing during sleep.
This is because alcohol relaxes the throat muscles and tongue, which in turn constricts the airway and creates a snoring vibration.
The Rumble Blaster from Dreamgear, for instance, has a light-up LED and a vibration rumble feature.
However, despite the fantastic nature of this controller, it has lost the vibration function from the original version.
The standard black wired Xbox Controller S is the popular choice, with its 2 analog controls, directional button pad, 4 action buttons, 2 trigger buttons, black and white buttons, and vibration feedback motors.
Wines you intend to store for six months or longer need to be away from temperature fluctuations, vibration, and light.
Place bottles on their sides in order to keep corks moist, and store away from temperature fluctuations, vibration, and light.
Store in a cool environment, at approximately 55 degrees, and keep the wine away from changes in temperature, light, and vibration.
For the countertop, keep the wine rack away from locations where there is a great deal of heat and vibration, such as on top of your refrigerator or above the stove or dishwasher.
Their 2003 Fumé Blanc from Alexander Valley shows a sprite nose of stone fruit, citrus, honeysuckle, fresh hay and a soft vibration of smoky oak.
They found that fortifying the wines with brandy did the trick, helping the wines bear up under the ship's vibration and high temperatures.
Wines are best stored in a temperature and humidity controlled environment with limited light and a place with minimal vibration.
Vibration is another thing that can begin to break down wine over the long term.
For about $100, you can store up to six bottles of wine in an environment that controls temperature and humidity and protects from the effects of vibration.
The room should be dark and free from excessive vibration.
Other important considerations for storage include avoiding light, vibration, and too much or too little humidity.
Motorola VE465 is a rugged flip phone with an external display, multimedia controls, 1.3 megapixel camera, and military reistance to dust, vibration, solar radiation and altitude.
Sometimes, things just go missing on a cell phone, like the vibration ability or a non-functioning speaker.
Repetitive motion or prolonged vibration can cause the lining of the channel to swell and press on the nerve.
A work history may reveal repetitive motion, chronic vibration, or industrial chemical exposure.
Chest physical therapy includes postural drainage, chest percussion, chest vibration, turning, deep breathing exercises, and coughing.
Often, percussion and vibration are performed in conjunction with postural drainage.
As with percussion, the purpose of vibration is to help break up lung secretions.
Vibration can be either mechanical or manual.
When done manually, the person performing the vibration places his or her hands against the patient's chest and creates vibrations by quickly contracting and relaxing arm and shoulder muscles while the patient exhales.
If you're looking to spend a little less and still bring holiday glee, check out Elmo's Tickle Hands, which your child can actually wear and hear Elmo phrases while experiencing a tickle vibration.
This vibration is what actually cooks your food when the infrared light connects with the food.
This increased motion or vibration creates friction, which in turn generates heat.
Some numbers known as master numbers are typically used as double digits because of the powerful vibration these numbers generate.
These numbers are the vibration of your essence and act like a magnet.
Many people make the claim that the movement of the pointer is the result of the vibration of people touching the it.
AlarMe is able to sense the audible alarms and alert the user through vibration or visual communication.
The loose nut could result in steering wheel vibration and loss of driver control.
You know how your car usually feels, and any change, especially if it's an increased vibration, can mean something is wrong.
A vibration in the pedals of the car can indicate a problem with the CV joint on a front-wheel drive car or the universal joint on a rear-wheel drive car.
A vibration that gets worse at higher engine speeds can mean a problem with your spark plugs, fuel injector, or engine valves.
A general loud vibration that increases with speed can mean a problem with your wheel bearings.
The French 'r' is pronounced by a rolling vibration deep in the back of the mouth/throat.
These two circuits are syntonized so that the closed or condenser circuit and the open or antenna circuit are adjusted to have, when separate, the same natural electrical time of vibration.
When spoken to the diaphragm vibrated, and thus set the carbon granules into vigorous vibration.
It follows that in testing iron for magnetic quality the greatest care must be exercised to guard the specimen against any accidental vibration.
That it is elastic, with narrow limits, is proved by its clear ring when struck with a hard body in circumstances permitting of free vibration.
This is generally equal to the number of waves issuing from the source per second, and therefore equal to its frequency of vibration.
If we study the source producing it we find that there is no regularity of vibration.
A musical note always arises from a source which has some regularity of vibration, and which sends equally-spaced waves into the air.
Various instruments have been devised which produce any desired note, and which are provided with methods of counting the frequency of vibration.
Imagine now that a fork with black prongs is held near the cylinder with its prongs vertical and the plane of vibration parallel to.
Another important result of the investigation was that the phase of vibration of the fork was not altered by bowing it, the amplitude alone changing.
If the fork makes exactly 32 vibrations and the wheel 8 revolutions in one pendulum beat, then the positions will be fixed, and every two seconds, the time of a complete pendulum vibration, he will see the two positions looked at flash out in succession at an interval of a second.
But there is always leakage of energy either through friction or through wave-emission, so that the vibration only increases up to the point at which the leakage of energy balances the energy put in by the applied force.
Further, the greater the dissipation of energy the less is the prominence of the amplitude of vibration for exact coincidence over the amplitude when the periods are not quite the same, though it is still the greatest for coincidence.
Suppose that a mass M is controlled by some sort of spring, so that moving freely it executes harmonic vibrations given by -µx, where µx is the restoring force to the centre of vibration.
Each of them is supposed to have its own natural frequency, and to be set into vibration when the ear receives a train of waves of that frequency.
The vibration in some way arouses the sensation of the corresponding tone.
In the one, the energy of vibration of the source is measured, and the rate at which that energy decreases is observed.
The energy of this fork with a given amplitude of vibration could be calculated from its dimensions and elasticity, and the amplitude was observed by measuring with a microscope the line into which the image of a starch grain on the prong was drawn by the vibration.
The rate of loss of energy was calculated from the rate of dying down of the vibration.
When the plate vibrated the mirror was vibrated about the fixed edge, and the image of a reflected slit was broadened out into a band, the broadening giving the amplitude of vibration of the plate.
As a preliminary to the investigation of the modes of vibration of certain sources of sound we shall consider the formation of " stationary waves."
We shall deduce the modes of vibration of the air column in a cylindrical pipe from the consideration that the air in motion within the pipe forms some part of a system of stationary waves, one train being formed by the exciter of the disturbance, and the other being formed by the reflection of the train at the end of the pipe.
The first mode of vibration gives the " fundamental tone," and the succeeding modes are termed " overtones."
We may illustrate the successive modes of vibration by using as pipe a tall cylindrical jar, and as exciter a vibrating tuning-fork held over the mouth.
The stationary wave method regards the vibration in the pipe as due to a series of waves travelling to the end and being there reflected back down the pipe.
If U 4 is the velocity of longitudinal waves along the sounder, and 1 the length of the sounder, the frequency of vibration is U 8 /2l.
The extent of vibration at different parts of the pipe was studied through a glass side wall, a stroboscopic method being used to get the position of the vapour line at a definite part of the vibration.
We shall then show that on certain limitations two trains of disturbance may be superposed so that stationary waves may be formed, and thence we shall deduce the modes of vibration as with pipes.
Since the nodes are always at rest we may represent the vibration of a given string by the length between any two nodes.
A practised ear easily discerns the coexistence of these various tones when a pianoforte or violin string is thrown into vibration.
The velocity of a disturbance along such a bar, and its modes of vibration, depend therefore on the elastic properties of the material and the dimensions of the bar.
For a bar free at both ends the fundamental mode of vibration has two nodes, each 0.224 of the length from the end.
The plate is then bowed at the edge and is thrown into vibration between nodal lines or curves and the sand is thrown from the moving parts or ventral segments into these lines, forming " Chladni's figures."
It is easy to deduce the modes of vibration from stationary waves as in the previous cases.
When the flame is at a certain distance within the tube the air is set in vibration, and the sounding tube gives out its fundamental note continuously.
The flame appears to lengthen, but if the reflection is viewed in a vertical mirror revolving about a vertical axis or in Koenig's cube of mirrors, it is seen that the flame is really intermittent, jumping up and down once with each vibration, sometimes apparently going within the jet tube at its lowest point.
Intermittent illumination, however, with frequency equal to that of the fork shows at once that the jet is really broken up into drops, one for each vibration, and that these move over in a steady procession.
When a system is set vibrating and left to itself, the vibration gradually dies away as the energy leaks out either in the waves formed or through friction.
If the bob of the pendulum is iron, and if a coil is placed just below the centre of swing, then, if a current passes through the coil, while and only while the bob is moving towards it, the vibration is maintained.
If the current is on while the bob is receding the vibration is checked.
If it is always on it only acts as if the value of gravity were increased, and does not help to maintain or check the vibration, but merely to shorten the period.
The circuit of the electro-magnet is made and broken by the vibration of the fork in different ways - say, by a wire bridge attached to the lower prong which dips into and lifts out of two mercury cups.
Hence the attracting force does more work in the return journey than is done against it in the outgoing, and the balance is available to increase the vibration.
When the motion due to the vibration is up along the pipe from the embouchure, the air moves into the pipe from the outside, and carries the sheet-like stream in with it to the inside of the sharp edge.
Hence the stream of air does work during half the vibration and this is not abstracted during the other half, and so it goes on increasing the motion until the supply of energy in blowing is equal to the loss by friction and sound.
There will be more kinetic energy formed in the return journey and the vibration tends to grow.
But if the heat is given at the instant of greatest rarefaction, the increase of pressure lessens the difference from the undisturbed pressure, and lessens the potential energy, so that during the return less kinetic energy is formed and the vibration tends to die away.
But there is a slight delay in ignition, partly due to expulsion of incombustible gas drawn into the jet tube in the previous half period, so that the most copious supply of gas and heat is thrown into the quarter period just preceding greatest pressure, and the vibration is maintained.
The heat communication is then chiefly in the quarter vibration just preceding greatest rarefaction, and the vibration is not maintained.
If the amplitudes of vibration which thus mutually interfere are moreover equal, the effect is the total mutual destruction of the vibratory motion.
If a tuning-fork in vibration be turned round before the ear, four positions will be found in which A B it will be inaudible, owing to the mutual interference FIG.
But, after this, the first or less rapidly vibrating note will fall behind the other, and cause a diminution in the joint displacements of the particles, till, after the lapse of onesixth of a second, it will have fallen behind the other by half a vibration.
This will be followed by an increase of intensity until the lapse of another sixth of a second, when the less rapidly vibrating note will have lost another half-vibration relatively to the other, or one vibration reckoning from the original period of time, and the two component vibrations will again conspire and reproduce a maximum effect.
If one prong of each fork be furnished with a small plain mirror, and a beam of light from a luminous point be reflected successively by the two mirrors, so as to form an image on a distinct screen, when one fork alone is put in vibration, the image will move on the screen and be seen as a line of a certain length.
If both forks are in vibration, and are prefectly in tune, this line may either be increased or diminished permanently in length according to the difference of phase between the two sets of vibrations.
This is termed the vibration strength.
This equal openness to every vibration of his environment is the key to all Erasmus's acts and words, and among them to the middle attitude which he took up towards the great religious conflict of his time.
Let E be the effective elasticity of the aether; then E = pc t, where p is its density, and c the velocity of light which is 3 X 10 10 cm./sec. If = A cos" (t - x/c) is the linear vibration, the stress is E dE/dx; and the total energy, which is twice the kinetic energy Zp(d/dt) 2 dx, is 2pn2A2 per cm., which is thus equal to 1.8 ergs as above.
It thus appears that if the amplitude of vibration could be as much as 1 o_2 of the wave-length, the aether would be an excessively rare medium with very slight elasticity; and yet it would be capable of transmitting the supply of solar energy on which all terrestrial activity depends.
The word is particularly used of the cord of a bow, and of the stretched cords of gut and wire upon a musical instrument, the vibration of which.
Thus if a molecule were set into vibration at a specified time and oscillated according to the above equation during a finite period, it would not send out homogeneous vibrations.
If N be the frequency of a homogeneous vibration sent out by a molecule at rest, the apparent frequency will be N (1 v/ V), where V is the velocity of light and v is the velocity of the line of sight, taken as positive if the distance from the observer increases.
The homogeneity of vibration may also be diminished by molecular impacts, but the number of shocks in a given time depends on pressure and we may therefore expect to diminish the width of a line by diminishing the pressure.
It is not, however, obvious that the sudden change of direction in the translatory motion, which is commonly called a molecular shock, necessarily also affects the phase of vibration.
The one endeavours to determine the conditions, which are consistent with our knowledge of atomic constitution derived from other sources, and lead to systems of vibration similar to those of the actual atom.
If the medium which contains the vibration is divided into a sphere equal to k times the molecular vibration outside of which the effects of these molecules may be averaged up, so that its Roy.
Here n represents an integer which is 3 if the vibration is a simple doublet, but may have a higher integer value.
The fluorescent bands in this case appear to shift rapidly when the period of the incident vibration is altered, though the change may be small.
It would probably not be difficult to imagine a mechanical system having a number of free periods which when set into motion by a forced vibration shows a corresponding effect.
If the forced vibration is suddenly stopped, the free periods will appear but not necessarily with the same intensity when the period of the original forced vibration is altered.
In the case of the Kew pattern unifilar the same magnet that is used for the declination is usually employed for determining H, and for the purposes of the vibration experiment it is mounted as for the observation of the magnetic meridian.
The time of vibration is obtained by means of a chronometer, using the eye-and-ear method.
If the temperature of the magnet were always exactly the same in both the vibration and FIG 2.
They are also fitted with different forms of suspension in which the compass is mounted to obviate the mechanical disturbance of the card caused by the vibration of the hull in ships driven by powerful engines.
The introduction of powerful engines causing serious vibration to compass cards of the admiralty type, coupled with the prevailing desire for larger cards, the deviation of which could also be more conveniently compensated, led to the gradual introduction of the Thomson compass.
The fact that a comparatively brittle material like concrete can be subjected not only to heavy loads but also to the jar and vibration from the blows of a heavy pile ram makes it appear as if its nature and properties had been changed by the steel reinforcement.
It is now generally accepted that these sounds are produced by the vibration of the webs of the outer tail-feathers, the webs of which are modified.
Probably the most successful one has been a rotary engine invented by Mr Arthur Rigg.1 In this engine the stroke, and therefore the amount of water used, can be varied either by hand or by a governor while it is running; the speed can also be varied, very high rates, as much as 600 revolutions a minute, being attainable without the question of shock or vibration becoming troublesome.
Weber's hypothesis of electric atoms, capable of diffusing through metallic bodies and conductors of electricity, but capable of vibration only in non-conductors, it is possible that the ultimate mechanism of conduction may be reduced in all cases to that of diffusion in metallic bodies or internal radiation in dielectrics.
Although by compounding corresponding portions of the diagrams given by instruments of this type, it is possible to determine the range and direction of the movement of which they are the resolved parts, their chief value is that they enable us to measure with ease the extent of any vibration, half of which is called its amplitude, and the time taken to make any complete back-and-forth movement, or its period.
The currents induced in the coil are led to a dead-beat D'Arsonval galvanometer having the same natural period of vibration as the pendulum.
For Diatomic Or Compound Gases Clerk Maxwell Supposed That The Molecule Would Also Possess Energy Of Rotation, And Endeavoured To Prove That In This Case The Energy Would Be Equally Divided Between The Six Degrees Of Freedom, Three Of Translation And Three Of Rotation, If The Molecule Were Regarded As A Rigid Body Incapable Of Vibration Energy.
In 1879 Maxwell Considered It One Of The Greatest Difficulties Which The Kinetic Theory Had Yet Encountered, That In Spite Of The Many Other Degrees Of Freedom Of Vibration Revealed By The Spectroscope, The Experimental Value Of The Ratio S/S Was 1.40 For So Many Gases, Instead Of Being Less Than 4/3.
Since Much Smaller Values Are Found For More Complex Molecules, We May Suppose That, In These Cases, The Energy Of Rotation Of A Polyatomic Molecule May Be Greater Than Its Energy Of Translation, Or Else That Heat Is Expended In Splitting Up Molecular Aggregates, And Increasing Energy Of Vibration.
It Is Not At All Clear, However, That Energy Of Vibration Should Bear A Constant Ratio To That Of Translation, Although This Would Probably Be The Case For Rotation.
To obtain the complete solution of (II) we must of course superpose the free vibration (6) with its arbitrary constants in order to obtain a complete representation of the most general motion consequent on arbitrary initial conditions.
If the point of suspension have an imposed simple vibration f = a cos at in a horizontal line, the equation of small motion of the bob is mx= mg-l-,
The difference of phase of the forced vibration in the two cases is illustrated and explained in the annexed fig.
The body now passes once (at most) through its equilibrium position, and the vibration is therefore styled aperiodic.
For a complete solution of (34) we must of course superpose the free vibration (30); but owing to the factor ehlt the influence of the initial conditions gradually disappears.
Further, on examining the small variation in i/i, it appears that in a slightly disturbed slow precession the motion of any point of the axis consists of a rapid circular vibration superposed on the steady precession, so that the resultant path has a trochoidal character.
In a slightly disturbed rapid precession the superposed vibration is elliptic-harmonic, with a period equal to that of the precession itself.
This solution, taken by itself, represents a motion in which each particle of the system (since its displacements parallel to Cartesian co-ordinate axes are linear functions of the qs) executes a simple vibration of period 21r/u.
The vibration then appears to be transferret alternately from m to M at regular intervals.
Every particle of the system executes in general a simple vibration of the imposed period 27r/il, and all the particles pass simultaneously through their equilibrium positions.
The n formulae of this type represent a normal mode of free vibration; the individual particles revolve as a rule in elliptic orbits which gradually contract according to the law indicated by the exponential factor.
Hence, unless there be some reason to the contrary, each piece of a machine should be balanced on its axis of rotation; otherwise the centrifugal force will cause strains, vibration and increased friction, and a tendency of the shafts to jump out of their bearings.
The insular position of England, combined with the nature of the English people, has allowed us to feel the vibration of European movements later and with less of shock than any of the continental nations.
He explained accurately the mechanism of the bones of the ear, and he discussed the physiological action of the cochlea on the principles of sympathetic vibration.
These earthquake shocks have two distinct characteristics, a slight vibration, sometimes almost imperceptible, called a temblor, generally occurring at frequent intervals, and a violent horizontal or rotary vibration, or motion, also repeated at frequent intervals, called a terremoto, which is caused by a fracture or displacement of the earth's strata at some particular point, and often results in considerable damage.
Now that the length of a division has been estimated a priori, it is perhaps preferable to reverse Plateau's calculation, and to exhibit the frequency of vibration in terms of the other data of the problem.
Magnus showed that the most important part of the effect is due to the forced vibration of that side of the vessel which contains the orifice, and that but little of it is propagated through the air.
According to theory, there would be no well-defined lower limit; on the other side, the external vibration cannot be efficient if it tends to produce divisions whose length is less than the circumference of the jet.
When the resolution is effected in a perfectly periodic manner, each drop is in the same phase of its vibration as it passes through a given point of space; and thence arises the remarkable appearance of alternate swellings and contractions described by Savart.
The interval from one swelling to the next is the space described by the drop during one complete vibration,and is therefore (as Plateau shows) proportional ceteris paribus to the square root of the head.
The time of vibration is of course itself a function of the nature of the fluid and of the size of the drop. By the method of dimensions alone it may be seen that the time of infinitely small vibrations varies directly as the square root of the mass of the sphere and inversely as the square root of the capillary tension; and it may be proved that its expression is - V C?
Regular vibration has, however, the effect of postponing the collisions and consequent scattering of the drops, and in the case of a direction of motion less nearly vertical, may prevent them altogether.
The second obstacle is surmounted by the aid of the stroboscopic method of observation, the light being intermittent in the period of vibration, so that practically only one phase is seen.
The principal vibration, in which the section becomes elliptical, corresponds to n = 2.
Since the phase of vibration depends upon the time elapsed, it is always the same at the same point in space, and thus the motion is steady in the hydrodynamical sense, and the boundary of the jet is a fixed surface.
A formula, similar to (5), may be given for the frequencies of vibration of a spherical mass of liquid under capillary force.
As will be seen from these figures, the wing during its vibration sweeps through a comparatively very large space.
If the wing was inelastic, every part of it would reverse at precisely the same moment, and its vibration would be characterized by pauses or dead points at the end of the down and up strokes which would be fatal to it as a flying organ.
He, in fact, endeavours to prove that a bird wedges itself forward upon the air by the perpendicular vibration of its wings, the wings during their action forming a wedge, the base of which (c b e) is directed towards the head of the bird, the apex (a f) being directed towards the tail (d).
If a rigid rod, or a wing with a rigid anterior margin, be made to vibrate, the vibration is characterized by an unequal jerky motion, at the end of the down and up strokes, which contrasts strangely with the smooth, steady fanning movement peculiar to natural wings.
It must not only be strong enough to sustain all possible vertical loads, but it must be sufficiently rigid to resist without deformation or weakening all lateral disturbing forces, the principal of which are the pressure of wind, the possible sway of moving crowds or moving machinery, and the vibration of the earth from the passage of loaded vans and trolleys, and slight earthquakes which at times visit almost all localities.
In American practice the use of steel in buildings of ten or more storeys, or in manufacturing plant where the floor loads are heavy and frequently " live " in the sense of causing vibration, has led to more careful specifications as to the quality of materials and character of workmanship, and it is the custom of the leading architects to have the structural frame inspected and tested during manufacture at the foundries, rolling-mills and shops by a firm of engineers making a speciality of such inspections.
In addition to his philosophical work, AzaIs studied music under his father, Pierre Hyacinthe AzaIs (1743-1796), professor of music at Soreze and Toulouse, and composer of sacred music in the style of Gossec. He wrote for the Revue musicale a series of articles entitled Acoustique fondamentale (1831), containing an ingenious, but now exploded, theory of the vibration of the air.
When a system vibrating in a free period of its own encounters, say through the medium of an enveloping aether, a second system having a different free period, and sets it in vibration, the amplitude of the second vibration is inconsiderable, except when the periods approach equality.
In such a case the two systems must be regarded as a single more complex one, the absorbed vibration becomes large, though remaining always finite, and the transmitted vibration undergoes a remarkable change in its period.
The line n shows the factor by which the index of refraction of the transmitted vibration is multiplied, and the curve p the intensity of the absorbed vibration for that wave-length.
If the knife - edges be placed so that and h 2 are below the lines x i y i and x2y2 respectively, the arrangement will favour the " vibration " principle, and is suited to act with and assist a " vibrating " steelyard.
To deaden the vibration of the springs after a load has been placed on the platform, and thus to enable the weights and values of the goods to be read rapidly, the piston of a glycerin cylinder is attached to the end of the lever which pulls upon the hook of the horizontal bar and is worked by it in the glycerin.
This can be accomplished by attaching balance-weights to the pulley until it will remain stationary in all positions, when its shaft rests on two horizontal knife-edges in the same horizontal plane, or, preferably, the pulley and shaft may be supported on bearings resting on springs, and balanced by attached masses until there is no perceptible vibration of the springs at the highest speed of rotation.
Each consists in essence of a tightly stretched membrane or drum which is thrown into a state of rapid vibration by a powerful muscle attached to its inner surface and passing thence downwards to the floor of the thoracic cavity.
Now Fresnel's formulae were obtained by assuming that the incident, reflected and refracted vibrations are in the same or opposite phases at the interface of the media, and since there is no real factor that converts cos T into cos (T+p), he inferred that the occurrence of imaginary expressions for the coefficients of vibration denotes a change of phase other than 7r, this being represented by a change of sign.
One method consists in finding directly the elliptic constants of the vibration by means of a quarterwave plate and an analyser; but the more usual plan is to measure the relative retardation of two rectangular components of the stream by a Babinet's compensator.
It is most important the stand should be free of vibration.
This vibration may be experienced by someone who may have latent clairvoyance and occasionally ' seen ' as a ghost.
This reduced vibration, the limiting factor with parallel twins and made for an efficient combustion chamber.
The motor holder consists of a rubber part at the center to act as a vibration damper.
Back problems, cement dermatitis, vibration white finger and deafness can ruin people's lives and force them out of their chosen profession.
The locations on the board at which zero vibration displacement occurs are called nodes, and the maximum displacement amplitudes occur at the antinodes.
A single string could seem to be any one of several particles depending on its state of vibration, particularly its vibrational frequency.
A technique for calculating the time domain averages of the vibration of the individual planet gears and sun gear in an epicyclic gearbox.
The building block approach is used to account for the effect of foundations on systems designed to provide vibration isolation.
We used a heavy paving mallet to put a vibration impulse into the floor with simultaneous measurements being made in both buildings.
Aimed at employers, this leaflet outlines the ways that hand-arm vibration can be controlled.
Its ergonomic design puts silky smooth multi-speed vibration right at the tip of your fingers.
What I DO notice is that roads with a coarse, or damaged, top dressing can induce pronounced high-frequency vibration.
Some people also may feel uplifted in their vibration just by holding the wand in their hand.
The disturbance, consisting of transverse vibrations, is propagated outwards in all directions from the centre; and, in consequence of the symmetry, the direction of vibration in any ray lies in the plane containing the ray and the axis of symmetry; that is to say, the direction of vibration in the scattered or diffracted ray makes with the direction of vibration in the incident or primary ray the least possible angle.
One prong of the fork carries a microscope objective, wart of a vibration microscope, of which the eyepiece is fixed at the back of the clock and the Lissajous figure FIG.
A 2006 paper presented in the proceedings from the 12th International Conference on Low Frequency Noise and Vibration and its Control reported that cats purr as a natural healing mechanism.
In addition to adjusting the DIN settings, ski bindings should be adjusted if you use lifters, vibration dampeners and to accommodate the amount of fore-aft position of the bindings.
One method of attraction is to recreate this energy vibration by using the numbers as often as possible.