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.