Adjacellt angles to Aerosol

Adjacent angles. (Math.) Angles in
which one leg is common to both.
Adjacent Channel. The next radio channel to that required, normally spaced by 200 kHz from wanted station.
Adjust. To. bring about a proper ar­rangement of parts as regards rela­tion, position, fit, etc.
<\djustable boring tool. (Mach.) A
tool in which the cutter can be set for different jobs, avoding the necessity of changing both cutter and holder.
Adjustable condenser. (Elec.) A con­denser in w~ich the capacity may be varied to suit changing needs, by means of movable plates.
Adjustable parallels. (Mach. ) Wedge­shaped bars on iron placed with the thin end of one on the thick end of the other. The top face of the upper and the bottom face of the lower remain parallel, but the distance between the two faces can be in­creased or decreased, and the bars locked in position by means of a screw to prevent shifting.
Adjustable pitch propeller. (Aero.) One whose blades are so attached to the hub that they may be set to any desired pitch when stationary.
Adjustable reamer. (Mach.) A reamer which can be increased in size, usually by means of a central bolt or screw, the tightening of which causes an expansion of the reamer.
o Adjustable resistance. (Elec.) Also called variable resistance. A resis­tance which admits of increase or decrease.

Adjustable speed motor. (Elec.) A motor whose speed can be varied over a wide range and when oncc adjusted remains constant regard­less of load.
Adjustable tap. (Mach.) Taps, usu­ally made with inserted blades or chasers capable of radial adjust­ment.
Adjusting screw. (Mach.) A set­screw, by the use of which the position of m~chine parts is ad­justed or regulated more accurately than would be possible by the mere setting to dimensions.
Adjustment. (Mach.) The placing and setting of engine or machine parts in related position.
Adjustment strips. (Mech.) Wedge­
shaped strips of metal by means of which the exact bearing of sliding surfaces is accurately adjusted, cor­rect contact being obtained by the use of set or adjustment screws.
Adman. (Print.) One who prepares o advertising material.
Admittance. (Elec.) The opposite of impedance. A unit, measured in ohms, used in alternating-current circuits.
Adulteration. Making impure by the addition of baser ingredients or foreign substances.
Advance. (Auto. Elec.) To adjust the timing of the spark to occur earlier with regard to time of top dead center of piston position. (Metal.) A copper, nickel alloy used for electrical-instrument work.
Advance editing. In VCRs, a com­bination of a built-in features de­

AdvertisillK to erosol

signed to ease the editing of home movies. Includes flying erase heads, digital super-imposers, pre-roll, as­semble editing capability, edit pre­view and more.
Advertising. The act of preparing and
circulating public announcements.
Adz. A cutting tool with the blade set
at right angles to the handle; used
for rough-dressing timber.
Adz-eye hammer. (Woodwk.) Usually the claw-type nail hammer in which the eye is extended to give a longer bearing on the handle than is the case with other hammers.
Aerated water. (Chern.) Water puri­
fied by pas~ing air through it.
Aeration. (Chern.) The passing of air through water or other liquid to effect purification; exposure to the
chemical action of air. (Plumb.) A
secondary tank in a sewage disposal plant in which the sewage is raised, by a mechanical device, from' the bottom of the tank and discharg~d over the retained liquid. The circu­lation of the sewage and the conse­quent exposure to the atmosphere reduces the sewage to a stable efflu­ent.'
Aerial. (Elec.) A term used in wire­less. It consists of a single conduc­tor or group of conductors. Usually suspended between two high points, on buildings, towers, or poles, for the purpose of receiving or radiat­ing into space the electromagnetic waves conveying the signal: It is also
called an "antenna."
Aerial metal. (Metal.) A very strong alloy of aluminium an<) lithium. It is very light, weighing only about 100 pounds per cubic foot.
Acrobatics. (Aero.) Voluntary eVQlu­. tions with an aircraft other ,than
those .required for normal flight.
Aerodynamic balanced surface.
(Aero.) A control surface that ex­
tends on both sides of the axis of the hinge or pivot, or that has aux­iliary devices or extensions con­nected with it in such a manner as to effect a small or zero resultant moment of the air forces about the hinge axis.
Aerodynamic center, wing section. (Aero.) A point located on or near the chord of the mean line, ap­proximately one quarter of the chord len&th aft of the leading edge and about which the moment co­efficient is practically constant.
Aerodynamics. (Aero.) That branch of science which treats of the mo­tion of air and other gaseous flu­ids, and of the forces on solids moving in such fluids.
Aerodynamic volume. (Aero.) The total volume of an aerostat, includ­ing its projecting parts.
Aerodyne. (Aero.) A generic term for aircraft that derive their lift in flight chiefly from aerodynamic force~.
Aerolite. . (Metal.) An aluminium alloy containing about 96 per cent aluminium. Specific gravity 2.74. Used for airplane and automotive parts.
Aeronautics. The art and science re­
lating to the flight of aircraft.
Aerosol. A liquid substance sealed in

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