D is the drum-head which gives the fraction of a revolution, d that which gives the whole number of revolutions, I is the index or pointer at which both drums are read.
Nut and screw are rotating at the same speed, the position - of the former will remain fixed; and as the nut is driven by friction from the surface of the cone, this equality of speed will obtain only when the product of the diameter (d) of the cone at that position multiplied into its speed of rotation (n) equals the product of the diameter (a) of the disk multiplied into the speed of rotation (N) of the screw, or N/n = d/a, and thus the ratio of cable paid out to that of wire paid out is continuously given by a pointer controlled 1 See Sir W.
I I the edge of the disk serves as the pointer and the scale gives the percentage of slack, or (N - n)/n.
When one of a series of keys (each corresponding to a letter) arranged round a pointer is depressed, the motion of the pointer, which is geared to the shuttle armature, is arrested on coming opposite that particular key, and the transmission of the currents to line is stopped, though the armature itself can continue to rotate.
To this class belong most of the useful dogs, such as the spaniel, the setter, the pointer and the sheepdog.
Walsh), in British Rural Sports, classified dogs as follows: - (a) Dogs that find game for man, leaving him to kill it himself - the pointer, setters, spaniels and water spaniels.
- Bloodhound, otterhound, foxhound, harrier, beagle, basset hound (smooth and rough), dachshund, greyhound, deerhound, Borzoi, Irish wolfhound, whippet, pointer, setter (English, Irish and black and tan), retriever (flat-coated, curlycoated and Labrador), spaniel (Irish water, water other than Irish, Clumber, Sussex, field, English springer, other than Clumber, Sussex and field: Welsh springer, red and white and Cocker); fox terriers (smoothand wire-coated); Irish terrier, Scotch terrier, Welsh terrier, Dandie Dinmont terrier, Skye terrier (prick-eared and drop-eared), Airedale terrier and Bedlington terrier.
Excepting for greyhounds, however, high prices are rarely offered for sporting dogs, 300 guineas for the pointer "Coronation" and 200 guineas for the retriever "High Legh Blarney" being the best reported prices for gun dogs during the last few years.
It is probable that pointer blood was introduced in the course of shaping the various breeds of setter.
The Dalmatian or coach dog (sometimes called the plumpudding dog) is a lightly built pointer, distinguished by its spotted coloration, consisting of evenly disposed circular black spots on a white ground.
The original breed is said to have been used as a pointer in the country from which it takes its name, but has been much modified by the fancier's art, and almost certainly the original strain has been crossed with bull-terriers.
The deflection is indicated by a pointer upon a graduated scale, the readings being interpreted by comparison with two standard specimens supplied with the instrument.
To take a reading the torsion-head is turned until an aluminium pointer attached to the coil is brought to the zero position on a small scale; the strength of the field is then proportional to the angular torsion.
A comparison with the method of a material pointer, attached to the parts whose rotation is under observation, and viewed through a microscope, is of interest.
The weighing is conducted in the usual way by vibrations, except when the weight be small; it is then advisable to bring the pointer to zero, an operation rendered necessary by the damping due to the adhesion of water to the fibre.
It consists of a steelyard mounted on a fulcrum; one arm carries at its extremity a heavy bob and pointer, the latter moving along a scale affixed to the stand and serving to indicate when the beam is in its standard position.
This is called " quadrant elevation," and the proper inclination was given by means of the " gunner's quadrant," a quadrant and plumb bob, one leg being made long to rest in the bore, or by bringing lines scribed on the breech of the gun in line with a pointer on the carriage; these were called " quarter sights."
Personal error is to a great extent eliminated, power of vision extended, the sight is self-contained, there is no fore-sight, a fine pointer in the telescope being aligned on the target.
Skoda howitzer, which is really a mortar as defined above, direction is given by means of a pointer on the mounting and a graduated arc on the bed.
Minor improvements in tangent sights certainly were made, notably an automatic clamp, but quadrant elevation was mainly used, and in the case of guns equipped with position-finders (see Range-Finder) the guns could be layed for direction by means, of a graduated arc on the emplacement and a pointer on the mounting.
There must be two sets of elevating gears, one which brings the axis of the gun and the sights together on to the target, thus finding the angle of sight and also pointing the axis of the gun at the target, and a second by which, independent of the sight which remains fixed, the elevation due to the range can be given to the gun and read by means of a pointer and dial marked in yards for range.
The diamond-shaped pointer is always in focus; focusing for individual eyesight is effected by turning the eye-piece, which is furnished with a scale for readjustment.
Raining dials placed on the mountings where they can be read by the layers, and more accurate elevation indicators have made laying by quadrant elevation, and in certain cases giving direction by means of graduated arc and pointer, both accurate and rapid, so that once more this system of laying is coming into favour for long ranges.
The lines traced out by the vibrating pointer are thus prevented from overlapping when more than one turn is given to the cylinder.
Sage-hens, grouse and small birds the coyote hunts successfully alone, quartering over the ground like a trained pointer until he succeeds in locating his bird, when he drops flat in the grass and creeps forward like a cat until close enough for the final spring."
However often she told herself that she must not get irritable when teaching her nephew, almost every time that, pointer in hand, she sat down to show him the French alphabet, she so longed to pour her own knowledge quickly and easily into the child--who was already afraid that Auntie might at any moment get angry--that at his slightest inattention she trembled, became flustered and heated, raised her voice, and sometimes pulled him by the arm and put him in the corner.