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.

Biplane--An aeroplane of which the main lifting surface consists of a
surface or pair of wings mounted above another surface or pair of wings.

Bay--The space enclosed by two struts and whatever they are fixed to.

Boom--A term usually applied to the long spars joining the tail of a
"pusher" aeroplane to its main lifting surface.

Bracing--A system of struts and tie wires to transfer a force from one
point to another.

Canard--Literally "duck." The name which was given to a type of
aeroplane of which the longitudinal stabilizing surface (empennage)
was mounted in front of the main lifting surface. Sometimes termed
"tail-first" aeroplanes, but such term is erroneous, as in such a design
the main lifting surface acts as, and is, the empennage.

Cabre--To fly or glide at an excessive angle of incidence; tail down.

Camber--Curvature.

Chord--Usually taken to be a straight line between the trailing and
leading edges of a surface.

Cell--The whole of the lower surface, that part of the upper surface
directly over it, together with the struts and wires holding them
together.

Centre (Line) of Pressure--A line running from wing-tip to wing-tip, and
through which all the air forces acting upon the surface may be said to
act, or about which they may be said to balance.

Centre (Line) of Pressure, Resultant--A line transverse to the
longitudinal axis, and the position of which is the resultant of the
centres of pressure of two or more surfaces.

Centre of Gravity--The centre of weight.

Cabane--A combination of two pylons, situated over the fuselage, and
from which anti-lift wires are suspended.

Cloche--Literally "bell." Is applied to the bell-shaped construction
which forms the lower part of the pilot's control lever in a Bleriot
monoplane, and to which the control cables are attached.

Centrifugal Force--Every body which moves in a curved path is urged
outwards from the centre of the curve by a force termed "centrifugal."

Control Lever--A lever by means of which the controlling surfaces
are operated. It usu