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Vent Stopper for Cannon

The Mystery of Comets' Tails

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

Trial Trip of the Steamer Shantung

Nova Scotia Patent Law

Army Rifles

General Butler

Condition of the Patent Office

New Destructive Cannon—Shellproof Vessels

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


  • Letters

    Correspondence - July 20, 1861

  • Departments

    Notes and Queries - July 20, 1861

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July 20, 1861

Science for the Modern World