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Features

Improved Forge Hammer, Naval Steam Engines

The War

Sigourney's Projectile

Inventors the Prosperous Class

Experiments with McCarty's Centrifugal Gun

James' Rifled Cannon—In What It Consists

Steel Clad Steam Chariots of War

The Beginning

Electrical Spirit Rappers—Interesting Development

Recent American Inventions

New Odorless Burning Fluid

United States Navy Yard

Patent Claims - July 6, 1861

To Our Readers

Departments

  • Letters

    Correspondence - July 6, 1861

  • Departments

    Notes and Queries - July 6, 1861

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