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A movable winch or windlass with powerful gearing, used with derricks, etc.

The valve gearing or mechanism by which steam is cut off from entering the cylinder of a steam engine after a definite point in a stroke, so as to allow the remainder of the stroke to be made by the expansive force of the steam already let in. See Expansion gear, under Expansion.

A pneumatic or hydraulic cushion for a falling weight, as in the valve gear of a steam engine, to prevent shock.

A tooth, as of a card, a gear wheel, etc. Knight.

rections are measured by the difference of their effect upon the needle. -- Differential gearing, a train of toothed wheels, usually an epicyclic train, so arranged as to constitute a differential motion. -- Differential motion, a mechanism in which a simple differential combination produces such a change of motion o…

The flanged outer end of a drawbar; also, a name applied to the drawgear.

A rod which unites the drawgear at opposite ends of the car, and bears the pull required to draw the train.

another part by contact with it, or through an intermediate relatively movable part, as a gear which drives another, or a lever which moves another through a link, etc. Specifically:

as to produce combinations of eccentric combinations of eccentric circles. -- Eccentric gear. (Mach.) (a) The whole apparatus, strap, and other parts, by which the motion of an eccentric is transmitted, as in the steam engine. (b) A cogwheel set to turn about an eccentric axis used to give variable rotation. -- Ecce…

To come into gear with; as, the teeth of one cogwheel engage those of another, or one part of a clutch engages the other part.

The state of being in gear; as, one part of a clutch is brought into engagement with the other part.

ners or address. -- En*ga"ging*ly, adv. -- En*ga"ging*ness, n. Engaging and disengaging gear or machinery, that in which, or by means of which, one part is alternately brought into gear or out of gear with another part, as occasion may require.

e motion from circular motion, on the principle that a pin fastened in the periphery of a gear wheel will describe a straight line when the wheel rolls around inside a fixed internal gear of twice its diameter.

uation. See under Absolute. -- Equation box, or Equational box, a system of differential gearing used in spinning machines for regulating the twist of the yarn. It resembles gearing used in equation clocks for showing apparent time. -- Equation of the center (Astron.), the difference between the place of a planet as…

steam. (b) A boiler or kettle in which is heated food for stock. -- Feed motion, or Feed gear (Mach.), the train of mechanism that gives motion to the part that directly produces the feed in a machine. -- Feed pipe, a pipe for supplying the boiler of a steam engine, etc., with water. -- Feed pump, a force pump for s…

That part of the acting surface of a gear wheel tooth that lies within the pitch line. Flank attack (Mil.), an attack upon the side of an army or body of troops, distinguished from one upon its front or rear. -- Flank company (Mil.), a certain number of troops drawn up on the right or left of a battalion; usually gren…

ow. Foremast hand or man (Naut.), a common sailor; also, a man stationed to attend to the gear of the foremast.

for striking by the friction of revolving rollers which nip the hammer rod. -- Friction gear. See Frictional gearing, under Frictional. -- Friction machine, an electrical machine, generating electricity by friction. -- Friction meter, an instrument for measuring friction, as in testing lubricants. -- Friction powd…

friction; moved by friction; produced by friction; as, frictional electricity. Frictional gearing, wheels which transmit motion by surface friction instead of teeth. The faces are sometimes made more or less V-shaped to increase or decrease friction, as required.

See Gear, Gearing.