Drawing to Drill brace.

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Drawing. (Arch.) The representation on a plain surface by means of lines, and shades, of some figure or ob­ject, either freehand or by the use of instruments. (Ceram.) Remov­ing ware form the kiln after it has been fired. (£nign.) As applied to the heat treatment of steel-heating to some temperature below the lower limit of the critical ran~e, followed by cooling as desired. (Mach.) The delineation of mahcinery and machine parts in plans, elevations, and sections, to proportional scales. (Metal.) (1) A process in the manufacture of wire. (2) The shaping of thin metal by use of dies.
Drawing back. (Metal.) Reheating to a temperature below the critical after hardening for the purpose of chang­ing the hardness of steel.
Drawing board. (Draft.) The board to which a draftsman attaches his paper preparatory to making a drawing. Drawing boards are made of white pine, basswood, or soft paper, and with either end or back battens.
Drawing die. (Metalwk.) Die used in power presses for pressing sheet metal into cuplike shapes.
Drawing in. (Textile) The threading of the warp threads through the loom harness.
Drawing ofpattem. (Fdry.) The lift­ing of a pattern from the molding sand.
Drawing of temper. The healing of steel to red and allowing it to cool slowly. The reverse of hardening or tempering.
Drawing out. (Forg.) A heating and hammering process by which a piece is lengthened, accompanied by a proportional reduction in sec­tion rea.
Drawing paper. (Paper.) A paper made for pencil, crayon, and pen­and-ink drawing purposes.
Drawing pen. (Draw.) The ruling pen used by draftsmen.
Drawknife. A two-handled wood­cutting tool having a long, narrow blade, the handles being at right angles to the blade.
Drawplate. (Fdry.) A plate with a threaded hole placed in a pattern. A draw screw inserted in this hole facilitates the removal of the pat­tern from the sand.
Draw screw. (Fdry.)A smaUrod with threads at one end for insertion in the threaded holes of the draw plate on a pattern.
Drawsheet. (Prillt.) The top sheet of a tympan on a platen press to which the guides and fenders are attached.
Draw spike. (Wood Patmkg.) The pointed metal rod with which a pattern is remov~d from the molding sand.
Draw table. (Furn.) A table which can be increased in size by draw­ ing extension leaves from beneath the top.
Dredge. A machine for removing mud or sand from the bed of a steam by scoops or by suction.lute.

Dress. (Mach.) To dress a tool means to restore a tool to its original shape and sharpness by forging or grind­mg.
Dresser. (Plumb.) A tool used for straightening lead pipe and sheet lead.
Dressing. (Textile) Substances used in cloth finishing to give stiffness and body.
Drier. (Paint.) A number of different driers are used for paints, such as (I) salt or oxides of lead and man­ganese boiled in oil; (2) sugar of lead; (3) litharge; (4) cobalt driers. (Print.) Material added to ink to hasten its drying.
Drift. (Aero.) The side speed or de­parture laterally from a normal course due to air currents. (Mech.) A strip of steel, rectangular in sec­tion, wedge-shaped in its length, used for driving drill sockets from their. spindles, etc.
Drift, wow, flutter. (I) Tendency of a tuner to move away from potimum adjustment as its components warm up. Compenstaed for by AFC.
(2) Abnormal speed variations which cause extraneous and unwanted fre­quency deviations in the reproduced signal of a tape machine.
Drift. Tape velocity changes which occur at very low frequencies, nor­mally below 0.1 Hz.
wow. Tape velocity changes w~ich occur at low frequ!tncies, between 0.1 and 10 Hz.
flutter. Tape velocity changes which occur at frequencies above 10 Hz.
Drift angle. (Aero.) TIle horizontal angle between the longitudinal axis of an aircraft and its path over the ground.
Drift bar. (Aero.) A part of a drift meter or other instrument for indi­cating the apparent direction of motion of the ground relative to the fore-and-aft axis of the aircraft. It usually consists of a wire or arm which can be set along this direc­tion of motion.
Drift field. Type of anoy-diffused transistor featuring very narrow base and with an accelerating or 'drift' field introduced between emitter and collector junctions.
Drift meter. (Aero.) An instrument which measures the angle between the longitudinal axis of an aircraft and its path over the ground.
Drift pin. (Mach.) A round tapered pin driven into rivet holes when they are not in perfect alignment. In some cases the holes may be distorted sufficiently to permit the setting of the rivet.
Drift plug. (Plumb.) A wooden plug driven through a lead pipe for the purpose of straightening out a kink.
Drift punch. (Mach.) A tool used to align rivet or bolt holes in adjacent parts so that they will coincide, or to drive out pins or rivets. (SEE DRIFT PIN.)
Drill. (Mech.)A tool for boring holes in metal or wood. Drills may be flat toward the point and simply beveled, or they may be of the twist type. (Mech. Drg.) Indicates that hole is to be made by drilling.
Drill brace. (Mech.) The name some­times given to an ordinary bit brace and breast drill.

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