Air-conditioner to Air-slaked lime.

Air-conditioner to Air gap

Air-conditioner. A system or process, for cQntrolling for reducing the tem­perature and humidity of. the air office, dwelling, theater etc.
Air conditioning. Relates to three different operations - air washing, humidifying, and dehumidifying.
Air control. (Aero.) The means em­ployed to operate the control sur­faces of the aircraft.
Air-cooled engine. (Auto. Mech.) A blower at the front of the engine forces air up over the cylinders into an enc1osedspace; from there it is forced down past the cylinders and other parts. The cylinders are ar­ral1ged individually, and are cast each with a series of fins around the circumferen'ce in order to present maximum radiating surface.
Air-cooled transformer. (Elec.) A transformer in which the heating of the coils sets up a ventilating draught.
Air-core solenoid. (Elec.) A solenoid which has a hollow rather than a solid core.
Aircraft. (Aero.) Any weight-carrying device designed to be supported by the air, either by buoyance or by dynamic ~ction.
Aircraft carrier. (Aero.) A ship de­signed to carry aircraft and to per­mit their landing and take-off.

Air cushion. Usually an air-filled cylinder so constructed as to serve as a .;hock absorber or as a device for regulating or arresting motion.
Airdried. (Lumber) Lumber sea­soned by drying in the air as op­posed to kiln-dried.
Air drill. (Mach.) A drill operated by
compressed air.
Air duct. (Aero.) A tube, usually of fabric, supplying air for filling ('f for maintaining pressure in air­filled parts of an aerostat.
Air flow. (Auto. Mech.) Refers to the passage of air over certain types of automobiles, so--designed that air friction is reduced to a minimum.
Airfoil. (Aero.) Any surface designed to be projected through the air to . produce a useful dynamic reaction.
Airfoil profile. (Aero.) The outline of an airfoil section.
Air-fuel section. (Aero.) A cross sec­tion of an airfoil made by plane parallel to a specified reference plane. A line perpendicular to this plane is called the axis of the airfoil.
Air-fuel ratio. (Auto.) The quantity of gasoline and air, expressed as a ratio of their respective weights that go to make up the fuel mix­ture of an internal-combustion en­gine.

15-1 by' weight 9600-1 by volume
Air furnace. (Fdry.) A type of fur­nace used in the production of mal­leable iron castings.
Air gap. (Elec.) Applied to a space in
a circuit which is solely occupied
by air, as an air gap in a spark plug.

Air log. (Aero.) An instrument whit:h measures the linear travel of an air­craft with relation to the air.
Airometer. An instrument for measur­
ing the rate of air flow.
Airplane. (Aero.) An aircraft heavier
than air, fitted with fixed wings and
power driver. . , .
Airplane dope. (Aero.) The liquid ma- ..
terial applied to the fabric surfaces of airplanes to increase their strength, to produce tautness by shrinking,
and to act as a filler for maintaining rairtightness.
Airplane tail. (Aero.) The rear part of

an airplane, usually consisting of a group of stabilizing planes, or fins, to which are attached certain con­trolling surfaces such as elevators and rudders. .
Air pocket. (Aero.) A nearly air cur­rent that can cause an aircraft to experience sudden change in alti­tude, usually a decrease.
Airport. (Aero.) A place regularly used for receiving or discharging passengers or cargo by air travel, or a place on land or water pro­vided with taking-off or landing accommodations, and which offers facilities for shelter, repair, and con­ditioning of aircraft.
Airport beacon. (Aero.) A beacon light of high candle power, located at or near an airport for the purpose of indicating the general or spe­cific location of the airport.
Air scoop. (Aero.) A scoop or hood to catch the air and maintain the air pressure in ballonets, internal-com­bustion engines, ventilators, etc.
Airship. (Aero.) A'lighter-than-air craft provided with a power and control system, e.g.. dirigible. When its power plant is not operat­ing it acts as a free balloon.
Airship station. (Aero.) (1) The com­plete assembly of sheds, masts, gas
plants, shops. landing fields, and'
other equipment required to oper­ate airships and supply their needs. (2) The base from which airships are,operated.
Air-slaked lime. (Chern.) Lime converted into hydroxide and carbonate by exposure to the air;