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Features

The Mystery of Comets' Tails

Vent Stopper for Cannon

Congress—The President's Message—Reports of the Secretaries of the Treasury, War and Navy

The War

Recent American Inventions

Corn Leaf and Grass Paper

Nova Scotia Patent Law

Trial Trip of the Steamer Shantung

Army Rifles

New Destructive Cannon—Shellproof Vessels

General Butler

Condition of the Patent Office

Thatcher's Comet

The Scientific American's Advice to Our Soldiers—Malaria and Its Remedies

Electrical Science

Wages of the Poorer British Classes

Patent Claims - July 20, 1861

To Our Readers

Instructions about European Patents

Allen's Clothes Dryer

Departments

  • Letters

    Correspondence - July 20, 1861

  • Departments

    Notes and Queries - July 20, 1861

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July 20, 1861

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