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Features

Improved Water Wheel

An English Lard Factory

The Explosion at Erith

Polytechnic Association of the American Institute

Farmers' Club

Fruitless Invention

Birds in Central Park

Galvanizing Iron-a Prize to the Inventor

Definitions of Gears

Explosions--Our Cities in Danger

The Market for the Month

Trial of the 1,000-Pound Cannon

Revolving Turrets or Broadside Ships?

Man Traps and Spring Guns

The Great Mechanical Problems of the Day

Patent Claims

Issued From the United States Patent-Office for the Week Ending October 25, 1864

Recent American Patents

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November 05, 1864

Beyond XX and XY

Biology. Identity. Equality.