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Jack :: "Jack (n.) A portable machine variously constructed, for exerting great pressure, 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 kind of jack..

Countersink :: Countersink (n.) An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt..

Worm :: Worm (n.) A short revolving screw, the threads of which drive, or are driven by, a worm wheel by gearing into its teeth or cogs. See Illust. of Worm gearing, below..

Propeller :: Propeller (n.) A contrivance for propelling a steam vessel, usually consisting of a screw placed in the stern under water, and made to revolve by an engine; a propeller wheel..

Bolt :: Bolt (n.) A strong pin, of iron or other material, used to fasten or hold something in place, often having a head at one end and screw thread cut upon the other end..

Tonophant :: Tonophant (n.) A modification of the kaleidophon, for showing composition of acoustic vibrations. It consists of two thin slips of steel welded together, their length being adjystable by a screw socket..

Helix :: Helix (n.) A nonplane curve whose tangents are all equally inclined 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..

Corkscrew :: Corkscrew (n.) An instrument with a screw or a steel spiral for drawing corks from bottles.

Turn-buckle :: Turn-buckle (n.) A loop or sleeve with a screw thread at one end and a swivel at the other, -- used for tightening a rod, stay, etc..

Chase :: Chase (v. t.) To cut, so as to make a screw thread..

Terminal :: Terminal (n.) Either of the ends of the conducting circuit of an electrical apparatus, as an inductorium, dynamo, or electric motor, usually provided with binding screws for the attachment of wires by which a current may be conveyed into or from the machine; a pole..

Wrench :: Wrench (v. t.) An instrument, often a simple bar or lever with jaws or an angular orifice either at the end or between the ends, for exerting a twisting strain, as in turning bolts, nuts, screw taps, etc.; a screw key. Many wrenches have adjustable jaws for grasping nuts, etc., of different sizes..

Screw :: Screw (v. i.) To turn one's self uneasily with a twisting motion; as, he screws about in his chair..

Chaser :: Chaser (n.) A tool with several points, used for cutting or finishing screw threads, either external or internal, on work revolving in a lathe..

Spanner :: Spanner (n.) An iron instrument having a jaw to fit a nut or the head of a bolt, and used as a lever to turn it with; a wrench; specifically, a wrench for unscrewing or tightening the couplings of hose..

Well :: Well (v. i.) A vertical passage in the stern into which an auxiliary screw propeller may be drawn up out of water.

Screw :: Screw (n.) A cylinder, or a cylindrical perforation, having a continuous rib, called the thread, winding round it spirally at a constant inclination, so as to leave a continuous spiral groove between one turn and the next, -- used chiefly for producing, when revolved, motion or pressure in the direction of its axis, by the sliding of the threads of the cylinder in the grooves between the threads of the perforation adapted to it, the former being distinguished as the external, or male screw, or,

Blade :: Blade (n.) The broad part of an oar; also, one of the projecting arms of a screw propeller..

Nut :: Nut (n.) A perforated block (usually a small piece of metal), provided with an internal or female screw thread, used on a bolt, or screw, for tightening or holding something, or for transmitting motion. See Illust. of lst Bolt..

Bed Screw :: Bed screw () A long screw formerly used to fasten a bedpost to one of the adjacent side pieces.

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