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Features

Is Smokeless Powder Reliable?

The Forty-Foot Entrance to New York Harbor

A Question of Governmental Economics

How Our Art Manufactures May Affect Our Exports

The Mechanical Engineers and the Patent Office

The Bicycle Industry

Wireless Telegraphy

The Chromo-Camera

A New Gas-Generating Machine

Niagara as an Industrial Center

A Novel Portable Folding Boat

An Automatic Siphon

The Old Line-of-Battle Ship "Pennsylvania"

The Radiophone at the Electrical Exhibition

Animal Communities

By C. F. Holder

The Efficiency of the Bicycle

An Improvement in Chemical Fire-Extinguishers

Departments

  • Letters

    Correspondence - May 27,1899

  • Recommended

    New Books, Etc. - May 27,1899

  • Departments

    The Heavens in June 1899

  • Business and Personal - May 27,1899

  • Notes and Queries - May 27,1899

  • Index of Inventions - May 27,1899

  • Recently Patented Inventions - May 27,1899

  • Patents - May 27,1899

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May 27, 1899

Beyond XX and XY

Biology. Identity. Equality.