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for gauging the commonly accepted dimensions or shape of certain parts in general use, as screws, railway-car axles, etc. (b) A gauge used only for testing other similar gauges, and preserved as a reference, to detect wear of the working gauges. (c) (Railroads) See Note under Gauge, n., 5. -- Star gauge (Ordnance), an…

or to afford a bearing surface; -- usually held or adjusted by means of a wedge, key, or screw. Gib and key, or Gib and cotter (Steam Engine), the fixed wedge or gib, and the driving wedge,key, or cotter, used for tightening the strap which holds the brasses at the end of a connecting rod.

A small tool for boring holes. It has a leading screw, a grooved body, and a cross handle. Gimlet eye, a squint-eye. [Colloq.] Wright.

ined to a given plane. The common helix is the curve formed by the thread of the ordinary screw. It is distinguished from the spiral, all the convolutions of which are in the plane.

fluted hardened steel cutter, resembling a tap, used in a lathe for forming the teeth of screw chasers, worm wheels, etc.

A screw hob. See Hob,

ted by a metallic cover. Hunter's room, the lunation after the harvest moon. -- Hunter's screw (Mech.), a differential screw, so named from the inventor. See under Differential.

-- Interior planets (Astron.), those planets within the orbit of the earth. -- Interior screw, a screw cut on an interior surface, as in a nut; a female screw.

sure, or lifting or moving a heavy body through a small distance. It consists of a lever, screw, rack and pinion, hydraulic press, or any simple combination of mechanical powers, working in a compact pedestal or support and operated by a lever, crank, capstan bar, etc. The name is often given to a jackscrew, which is a…

Milled, as the head of a screw, or the edge of a coin.

ond and fourth quarters; depending on the relative positions of the sun and moon. -- Lag screw, an iron bolt with a square head, a sharp-edged thread, and a sharp point, adapted for screwing into wood; a screw for fastening lags.

utting tool has an automatic feed; -- used chiefly for turning and boring metals, cutting screws, etc. -- Foot lathe, a lathe which is driven by a treadle worked by the foot. -- Geometric lathe. See under Geometric -- Hand lathe, a lathe operated by hand; a power turning lathe without an automatic feed for the tool.…

centers, in approaching it, at the instant when the valve opens to admit steam. -- Lead screw (Mach.), the main longitudinal screw of a lathe, which gives the feed motion to the carriage.

n direction. Left-handed marriage, a morganatic marriage. See Morganatic. -- Left-handed screw, a screw constructed to advance away from the observer, when turned, as in a nut, with a left-handed rotation. An ordinary wood screw is right-handed.

cover. -- Surveyor's level, a telescope, with a spirit level attached, and with suitable screws, etc., for accurate adjustment, the whole mounted on a tripod, for use in leveling; -- called also leveling instrument. -- Water level, an instrument to show the level by means the surface of water in a trough, or in uprig…

Rotation in the direction of an outgoing right-handed screw; counter-clockwise rotation; -- applied chiefly to the turning of the plane of polarization of light.

ing vessels which can not reach the wharves at the place of shipment or delivery. Lighter screw (Mach.), a screw for adjusting the distance between the stones in a grinding mill by raising or lowering the bridgetree.

the neck, which has nine or ten frets or divisions, and the head, or cross, in which the screws for tuning are inserted. The strings are struck with the right hand, and with the left the stops are pressed.

constrained, and by means of which force and motion may be transmitted and modified, as a screw and its nut, or a lever arranged to turn about a fulcrum or a pulley about its pivot, etc.; especially, a construction, more or less complex, consisting of a combination of moving parts, or simple mechanical elements, as whe…

llow and which it fits; as, a male gauge, for gauging the size or shape of a hole; a male screw, etc. Male berry (Bot.), a kind of coffee. See Pea berry. -- Male fern (Bot.), a fern of the genus Aspidium (A. Filixmas), used in medicine as an anthelmintic, esp. against the tapeworm. Aspidium marginale in America, and A…