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U.S. Patent 13,679: Andrew Hotchkiss projectile

U.S. Patent 13,679, granted to Andrew Hotchkiss in 1855, covered the three-part rifled projectile with a flexible lead ring and movable base that became the Hotchkiss system.

Also known as: Hotchkiss patent 13679.

NumberU.S. Patent 13,679
Year1855
InventorAndrew Hotchkiss
CoversThe three-part Hotchkiss rifled projectile

The Hotchkiss patent

United States Patent 13,679, issued to Andrew Hotchkiss in 1855, set out the projectile that became the Hotchkiss system: a rifled-cannon projectile in which a soft lead ring was held between an iron body and a movable base, so that firing forced the base forward and expanded the lead into the rifling.

This three-part construction was one of the most successful rifled-projectile designs of the Civil War, and the patent is the founding document of the Hotchkiss projectiles.

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