Here the crane-post is extended into a long mast and is furnished with pivots at the top and bottom; the mast is supported by two " back ties," and these are connected to the socket of the bottom pivot by the " sleepers."
Above, and revolves either on upper and lower pivots supported by the structure of the workshop, or on a fixed pillar secured to a heavy foundation.
There are two soft iron tongues, n, s, fixed upon and at right angles to an axle a, which works on pivots at its ends.
The knuckle stands open until the coupling is pushed against another coupling, when the two hooks turn on their pivots to the position shown in fig.
There was general agreement on foreign policy, whose pivots were close alliance with Czechoslovakia, the series of bilateral agreements which made up the Little Entente (Czechoslovakia and Yugoslavia Aug.
The doors had pivots of bronze revolving in well-fitted bronze cup-like sockets let into the thresholds.
4 shows the mounting of a Thomson card on its pivot, which in common with the pivots of most other compasses is made of brass, tipped with osmium-iridium, which although very hard can be sharply pointed and does not corrode.
From the pivots of booms which have a total length of 34 in.
It is utilized in the spindles of machinetools, in the balls and rollers for high-speed bearings, slides, pivots and such like.
(A) The pivots or bearings of the polar axis are placed at its extremities.
An oblong metallic box fitted with pivots, whose bearings are attached to the triangular beams, forms the tube for two parallel telescopes; these are separated throughout their length by a metallic diaphragm.
The declination axis is here represented by what are practically the trunnions or pivots of the tube, resting in bearings which are supported by the arms of a very massive cast-iron fork bolted to the upper end of the polar axis.
This axis is a hollow forging of nickel steel, of which the accurately turned pivots rest on bearings attached to cast-iron uprights bolted upon a massive cast-iron base plate.
This float dips into a tank filled with mercury so that practically the entire instrument is floated by the mercury, leaving only sufficient pressure on the bearings to ensure that the pivots will remain in contact with them.
A reversible level d rests on the accurately turned pivots of this axis.
In mechanism it is usually the central line either of a rotating shaft or axle having journals, gudgeons, or pivots turning in fixed bearings, or of a fixed spindle or dead centre round which a rotating bush turns; but it may sometimes be entirely beyond the limits of the turning body.
But a limit is put to th~ diminution of the radii of journals and pivots by the conditions 01 durability and of proper lubrication, and also by conditions 01 strength and stiffness.
Friction of Pivots and Collars.When a shaft is acted upon b a force tending toshift it lengthways, that force must be balanced by the reaction of a bearing against a pivot at the end of the shaft; or, if that be impossible, against one or more collars, or rings projecting from the body of the shaft.
The bearing of the pivot is called a step or footstep. Pivots require great hardness, and are usually made of steel.
Hence the pivots already mentioned wear unequally at different points, and tend to alter their figures.
This curve, bein~ an asymptote to its axis, is capable of being indefinitely proloi~ged towards X; but in designing pivots it should stop before the angle PTY becomes less than the angle of repose of the rubbing surfaces, otherwise the pivot will be liable to stick in its bearing.