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    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

    Amendments to the Patent Statutes

    Patent Attorneys Appeal

    Japanese Patents

    Another New Patent Law

    Automatic Strength Tester and Vending Machine

    The Boston Gas Explosion

    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

    • Index of Inventions - March 20, 1897

    • Notes and Queries - March 20, 1897

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    March 20, 1897

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