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Features

That Athbara Bridge Contract

Official Test of the New Army Wire Gun

Sine-Wave Telegraphy

What Our Consuls are doing for American Trade

A Parisian Egg Forger

American Machine Tools in England

The Heavens in May– April 29, 1899

By Garrett P. Serviss

National Academy of Sciences

By Marcus Benjamin

The Marvin Electric Rock Drill

A Convertible Plow

An Improved Band-Saw-Setting Machine

A Cheap Method of Making a Calorimeter

An Automatic Spring Fish-Hook

An Improved Lemon-Squeezer

Sutro Baths of San Francisco

By F. W. Parsons

Manufacture of Krag-Jorgensen Rifles at the Springfield Armory.--I

The Californian Sea Lion

To Inventors - April 29, 1899

Departments

  • Letters

    Correspondence - April 29, 1899

  • Recommended

    New Books Etc - April 29, 1899

  • Departments

    Recently Patented Inventions - April 29, 1899

  • Business and Personal - April 29, 1899

  • Notes and Queries - April 29, 1899

  • Index of Inventions - April 29, 1899

  • Patents - April 29, 1899

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April 29, 1899

Beyond XX and XY

Biology. Identity. Equality.