B
Balance—Equilibrium maintained by the controlling mechanism, or by the automatic action of balancing-surfaces—as distinguished from the equilibrium preserved by stabilizing surfaces.
Balancing Plane—The surface which is employed either intentionally, or automatically, to restore a disturbed balance.
Biplane—The type of aeroplane which has two main supporting surfaces or planes, placed one above the other.
Body—The central structure of an aeroplane, containing the machinery and the passenger space—as distinguished from the wings, or planes, and the tail.
Brace—A construction member of the framing of aircraft which resists a compression strain in a diagonal direction—as distinguished from a “stay,” or “diagonal,” which supports a pulling strain; also from a strut which supports a compression strain in a vertical direction.