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Features

Official Test of the New Army Wire Gun

What Our Consuls are doing for American Trade

That Athbara Bridge Contract

Sine-Wave Telegraphy

The Heavens in May– April 29, 1899

By Garrett P. Serviss

National Academy of Sciences

By Marcus Benjamin

A Parisian Egg Forger

American Machine Tools in England

The Marvin Electric Rock Drill

A Cheap Method of Making a Calorimeter

An Improved Band-Saw-Setting Machine

A Convertible Plow

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

  • Index of Inventions - April 29, 1899

  • Business and Personal - April 29, 1899

  • Notes and Queries - April 29, 1899

  • Patents - April 29, 1899

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April 29, 1899

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