Ballistic pendulum, an instrument consisting of a mass of wood or other material suspended as a pendulum, for measuring the force and velocity of projectiles by means of the arc through which their impact impels it.
Bal*lis"tics (&?;), n. [Cf. F. balistique. See Ballista.] The science or art of hurling missile weapons by the use of an engine. Whewell.
||Bal"li*um (&?;), n. [LL.] See Bailey.
Bal*loon" (&?;), n. [F. ballon, aug. of balle ball: cf. It. ballone. See 1st Ball, n., and cf. Pallone.] 1. A bag made of silk or other light material, and filled with hydrogen gas or heated air, so as to rise and float in the atmosphere; especially, one with a car attached for aërial navigation.
2. (Arch.) A ball or globe on the top of a pillar, church, etc., as at St. Paul's, in London. [R.]
3. (Chem.) A round vessel, usually with a short neck, to hold or receive whatever is distilled; a glass vessel of a spherical form.