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Features

Compressed Air System on the United States Monitor Terror

Important Amendments to the United States Patent Statutes

The Proposed Mammoth Relief Map of the United States

Japanese Patents

Patent Attorneys Appeal

Amendments to the Patent Statutes

Another New Patent Law

The Boston Gas Explosion

Automatic Strength Tester and Vending Machine

Alexander Herrmann Prestidigitator

By W. E. Robinson

A Four Sided Dovetail

Insects' Wings-Rapidity of Vibration in Flight

Departments

  • Letters

    Correspondence - March 20, 1897

  • Departments

    Recently Patented Inventions - March 20, 1897

  • Business and Personal - March 20, 1897

  • Notes and Queries - March 20, 1897

  • Index of Inventions - March 20, 1897

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March 20, 1897

Beyond XX and XY

Biology. Identity. Equality.

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