Altimeter--An instrument used for measuring height.
Air-Speed Indicator--An instrument used for measuring air pressures
or velocities. It consequently indicates whether the surface is
securing the requisite reaction for flight. Usually calibrated in
miles per hour, in which case it indicates the correct number of
miles per hour at only one altitude. This is owing to the density
of the air decreasing with increase of altitude and necessitating
a greater speed through space to secure the same air pressure
as would be secured by less speed at a lower altitude. It would
be more correct to calibrate it in units of air pressure.
Air Pocket--A local movement or condition of the air causing an
aeroplane to drop or lose its correct attitude.
Aspect-Ratio--The proportion of span to chord of a surface.
Air-Screw (Propeller)--A surface so shaped that its rotation about
an axis produces a force (thrust) in the direction of its axis.
Aileron--A controlling surface, usually situated at the wing-tip, the
operation of which turns an aeroplane about its longitudinal axis;
causes an aeroplane to tilt sideways.
Aviation--The art of driving an aeroplane.
Aviator--The driver of an aeroplane.
Barograph--A recording barometer, the charts of which can be calibrated
for showing air density or height.
Barometer--An instrument used for indicating the density of air.
Bank, to--To turn an aeroplane about its longitudinal axis (to tilt
sideways) when turning to left or right.
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