| 单词 | ballistic pendulum |
| 释义 | > as lemmasballistic pendulum ballistic pendulum n. now chiefly historical an apparatus for determining the velocity of a projectile from the amount of deflection produced when it strikes a target that is free to oscillate. ΘΚΠ the world > matter > physics > mechanics > dynamics > [noun] > speed or direction as vector quality > device to measure or record velocity ballistic pendulum1764 tachometer1810 velocimeter1842 velocity-measurer1850 gun-pendulum1867 the world > movement > rate of motion > [noun] > in the physical sciences > measurement of > instrument > for measuring velocity of projectiles ballistic pendulum1764 gun-pendulum1867 registrar1872 1742 B. Robins New Princ. Gunnery i. 27 If a Bullet of a known Weight strikes the Pendulum, and the Vibration, which the Pendulum makes in consequence of the Stroke, be ascertained, the Velocity, with which the Ball moved, is thence to be known.] 1764 B. Martin Physico-ballistics x in Gen. Mag. Arts & Sci. 8 335 (chapter title) The Quantity of the Air's resistance to Projectiles, and Bullets in particular, determined by Experiments on the Ballistic Pendulum. 1879 W. Thomson & P. G. Tait Treat. Nat. Philos. (new ed.) I: Pt. i. §298 Robins' Ballistic Pendulum, a massive cylindrical block of wood cased in a cylindrical sheath of iron closed at one end and moveable about a horizontal axis. 1931 C. E. Munroe & J. E. Tiffany Physical Testing Explosives 40 The ‘unit deflective charge’..is the weight of the explosive that has been found to deflect the pendulum of the Bureau of Mines ballistic pendulum to the same degree that the standard weight of..dynamite has deflected it in a previous test. 1998 G. I. Brown Big Bang iv. 39 The Trauzl test..was replaced around 1900 by the ballistic pendulum test. < as lemmas |
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