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Features

Improved Flying Machine, New Rifled Gun, and more

Report on Armstrong Guns

Correct Explanation of the Ghost

Discoveries and Inventions Abroad

Paper-Making in America

Working Steam Expansively

Miscellaneous Summary

Miles's Wagon Stake

The National Bank

Piston Speeds of Beam Engines

Thunder Storms--Lightning Conductors

Prize Exhibition of Farm Engines

Perpetual Motion

Applications for the Extension of Patents

Portable Engines

Recent American Patents

Patent Claims

To Our Readers

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August 29, 1863

Beyond XX and XY

Biology. Identity. Equality.