ballistic mortar

ballistic mortar

[bə′lis·tik ′mȯrd·ər]
(ordnance)
A heavy, short-barreled mortar, pendulum-mounted, for determining the relative power of explosives; a small sample of a test explosive is placed in the detonation chamber and a projectile is located forward of the charge; upon detonation the projectile is driven into a sand bank and the mortar swings through an arc; a marker records the maximum weight of the test explosive required to produce the same rise as 10 grams of TNT.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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