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Improved Thrashing and Cleaning Machine

The War

Spectral Analysis

Valuable Experiments in Gunnery

Interesting from Fort Pickens and Pensacola

Cochran's Improved Projectile

Raising Money for the War

The New Gunboats

Iron-Clad Frigates Again

Railway Accidents

Steam Wagons for Military Purposes

Iron Ships Not Invulnerable

America at the World's Fair in 1861

Making Steel Rifled Cannon


Patent Claims - July 13, 1861

Recent American Inventions

Instructions about European Patents

To Our Readers

Shields for Resisting Shot in Ships


  • Departments

    Notes and Queries - July 13, 1861

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