Duo tone to Dyne.

Duo-tone (Print.) An ink which, on drying, gives the work the appear­ance of having been printed in two different colours.
Dyuo-type. (Print.) Two halftone plates made from o.ne copy and etched differently.
Duplex carburetor. (Auto.) A carburetor which has a double venturi for mixture distribution.
Duplex printing. (Textile) The print­ing of a pattern on both sides of a fabric.
Duplex steel. (Metal.) A cheap low carbon steel produced by the acid Bessemer process with further
refihing in the basic open hearth. If the. second refining is done in an electric furnace the product should be of better quality.
Duplicate. To reproduCe exactly. Duplicate part. A part which is identical with and which would serve the same purpose as some other part.
Durability. (Masonry) The capacity to stand long anu hard use.
Dura1umin. (Aero.) An alloy much used in aeronautics on account of its strength and lightness. It is com­posed of copper, 3.5 to 4.5 per cent; manganese 0.4 to 1 per cent; mag­nesium 0.2 to 0.75 per cent, and aluminium 92 per cent minimum. Its ultimate tensile strength is 55,000 lb. per sq. in., elastic lifOit at 30,000 lb. per sq. in., and specific gravity not more than 2.85.
Duriron. (Metal.) A trade name for an iron rich in silicon. Used for drain-pipes in laboratories, etc., on account of its acid-resisting quali­ties.
Dust bottom. (Furn.) A thin surface of wood placed between drawers.
Dutch arch. A bonded arch, flat both top and bottom, with bricks slop­
ing from a common . center.
Dutch bond, or English cross bond. A bond in which the C9Urses are alternately made up of headers and stretchers.
Dutchman. (Meeh.) A piece fitted in to cover a defect.
Duthc metal. A very malleable alloy consisting of eleven parts copper to two parts of zinc.
Dwell. (Auto.) The period of time during which the contact points are separated. This is controlled by the carn shape.
Dwelling. (Arch.) A tenn of broad use, meaning a house or residence.
Dye (1) To fix a colour by soaking; . .(2) to stain or tint; (3) a colouring matter used for dyeing.
Dyewood. Wood that yields colour­ ing matter for dyeing. .
Dynafl".v transmission. (Auto. Meeh.) Consists of a hydraulic converter which, plus a planetary­gear set, gives the driver a choice
of direct drive, emergency low,. reverse, and neutral.
Dynamic balance. (Auto.) That type of balance which pennits parts to rotate without vibration at any speed for which they have been balanced.
Dynamic factor. (Aero.) The ratio between the load carried by any part of an aircraft when accelerat­ing and the corresponding basic load.

Dynamic lift. (Aero.) One of the four forces acting on an airplane in flight. Lift holds an airplane up.
Dynamic load. (Aero.) Any load due to the acceleration of an aircraft. The dynamic load is proportional to the mass of the aircraf~.
Dynamic pressure. (Aero.) The pro­duct of Yzp y2 where p is the density of the air and Y is the relative speed of the air.
Dynamics. That branch of mechanics which treats of the laws of forces that produce motion in bodies.
Dynamic speaker. (Radio) An appa­ratus for converting audio frequency currents into sound waves. It con­sists of an electromagnetic field in which is placed a .movable voice coil attached to a diaphragm.

Dynamic stability. (Aero.) A stabil­ity which tends to steady an 'air plane after it has been disturbed in its steady motion during t1ight.
Dynamite. An explosive composed of an absorbent saturated with ni­troglycerin.
Dynamiting. (Textile) Over weight­ing of silk with mineral salts.
Dynamo. (Elec.) An electrical ma­chine for converting mechanical energy into electrical energy.
Dynamometer. (Elec.) A name given an instrument or machine for meas­uring the amount of energy ex­pended in work.
Dyne. (phys.) A unit of force that will accelerate a particle having a mass of one gram one centimeter per second per second. (From the Greek word for power.)

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