Patent Model - Improvement in Sub-Caliber Projectiles
Maker and role
Edward Dana, Patentee
Nov 12 1872
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5 1/2 x 2 3/4" (14 x 7cm)
Dana's patent "consists in combining with the projectile proper a hard-metal collar, the outer periphery of the collar being coned so as to serve as an anvil, upon which the expanding ring of soft metal is driven and enlarged to fill the grooves. The anvil-collar fits upon a fluted shoulder of the projectile, and though it cannot turn or be driven forward onto the projectile it is free to drift off after leaving the gun." (Patent Number 132,903)
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