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Features

The Value of a Patent

The Armour Institute, Chicago

The World's Congress Auxiliary

Crank Shaping Machine

An Improved Mine Car

The Bicycle Industry

By Ben Bolder

A Hat Support for Miners' Lamps

An Improved Book or Copy Holder

An Improved Crude Oil Burner

An Improved Motor

The Universal Scale

A Novel Motor

The New Coast Defense War Ship Terror

Recreations in Photography

An Improved Traction Engine

Progress of the Cruiser Maine

The Utilization of Old Tin Cans

Departments

  • Letters

    Correspondence- March 24, 1893

  • Recommended

    New Books and Publications- March 24, 1893

  • Departments

    Recently Patented Inventions- March 24, 1893

  • Notes and Queries- March 24, 1893

  • Business and Personal- March 24, 1893

  • Index of Inventions- March 24, 1893

  • To Inventors- March 24, 1893

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March 25, 1893

Beyond XX and XY

Biology. Identity. Equality.

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