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Cross wires, fine wires made to traverse the field of view in a telescope, and moved by a screw with a graduated head, used for delicate astronomical observations; spider lines. Fixed cross wires are also used in microscopes, etc.

To make concave or in the form of a cup; as, to cup the end of a screw.

A hollow internally threaded screw-cutting tool, made in one piece or composed of several parts, for forming screw threads on bolts, etc.; one of the separate parts which make up such a tool. Cutting die (Mech.), a thin, deep steel frame, sharpened to a cutting edge, for cutting out articles from leather, cloth, paper,…

A stock to hold the dies used for cutting screws.

oisting pulley to which power is applied through a differential gearing. -- Differential screw, a compound screw by which a motion is produced equal to the difference of the motions of the component screws. -- Differential thermometer, a thermometer usually with a U-shaped tube terminating in two air bulbs, and conta…

Full of dole or grief; expressing or exciting sorrow; sorrowful; sad; dismal. With screwed face and doleful whine. South. Regions of sorrow, doleful shades. Milton.

Having two screw threads instead of one; -- said of a screw in which the pitch is equal to twice the distance between the centers of adjacent threads.

opeller is said to drag when the sails urge the vessel faster than the revolutions of the screw can propel her. Russell.

hine for drilling holes in metal, the drill being pressed to the metal by the action of a screw.

scape-wheel has two sets of teeth. See Escapement. -- Duplex lathe, one for turning off, screwing, and surfacing, by means of two cutting tools, on opposite sides of the piece operated upon. -- Duplex pumping engine, a steam pump in which two steam cylinders are placed side by side, one operating the valves of the ot…

uit. Endless chain, a chain which is made continuous by uniting its two ends. -- Endless screw. (Mech.) See under Screw.

hers. Feathering float (Naut.), the float or paddle of a feathering wheel. -- Feathering screw (Naut.), a screw propeller, of which the blades may be turned so as to move edgewise through the water when the vessel is moving under sail alone. -- Feathering wheel (Naut.), a paddle wheel whose floats turn automatically…

. -- Feed regulator, a device for graduating the operation of a feeder. Knight. -- Feed screw, in lathes, a long screw employed to impart a regular motion to a tool rest or tool, or to the work. -- Feed water, water supplied to a steam boiler, etc. -- Feed wheel (Mach.), a kind of feeder. See Feeder, n., 8.…

To turn, as a screw. [Scot] Jamieson.

The thread of a screw.

A plane for making a rabbet. Fillister screw had, a short cylindrical screw head, having a convex top.

Consisting of cards of one suit. Flush bolt. (a) A screw bolt whose head is countersunk, so as to be flush with a surface. (b) A sliding bolt let into the face or edge of a door, so as to be flush therewith. -- Flush deck. (Naut.) See under Deck, n., 1. -- Flush tank, a water tank which can be emptied rapidly for flu…

tangled by it. -- Fly powder, an arsenical powder used to poison flies. -- Fly press, a screw press for punching, embossing, etc., operated by hand and having a heavy fly. -- Fly rail, a bracket which turns out to support the hinged leaf of a table. -- Fly rod, a light fishing rod used in angling with a fly. -- Fl…

A fusible plug that screws into a receptacle, used as a fuse in electric wiring.

e of execution by strangulation, with an iron collar affixed to a post and tightened by a screw until life become extinct; also, the instrument by means of which the punishment is inflicted.