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Features

Hardening Composite Plates for Bank Vaults

Education in America

The Great Railroad Strike

Brooklyn Meeting of the A. A. A. S

Failure of a Large Armor Plate

An American Bullet Proof Shield

Laying an Atlantic Cable in Twelve Days

An Improved Tellurian

Electric Light Engines, Manchester Corporation

A New Telephone

Viaduct for Street Railways, Cincinnati

A Steam Ice Cream Manufactory

Roaring Alligators in the Zoological Gardens at Hamburg

The Albatross

Departments

  • Letters

    Correspondence - July 21, 1894

  • Recommended

    New Books and Publications - July 21, 1894

  • Departments

    Recently Patented Inventions - July 21, 1894

  • Index of Inventions - July 21, 1894

  • Notes and Queries - July 21, 1894

  • To Inventors - July 21, 1894

  • Business and Personal - July 21, 1894

  • Patents - July 21, 1894

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July 21, 1894

Beyond XX and XY

Biology. Identity. Equality.

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