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    Diamond Cutting--A New Industry in New York

    Specific Heat

    Crude Petroleum for Fuel and for Illuminating Gas

    Camphor

    The Fair of the American Institute

    Rescue of the Remaining Survivors of the Polaris

    The Planet Mars--Is it Inhabited?

    A Simple Tree Protector

    Self-Tightening Drill Chuck

    Calfskin Tanning in Europe

    The Great Exposition--Letter from United States Commissioner Professor R. H. Thurston

    The Danbury Drill Chuck

    Improved Plow Attachment

    Automatic Railroad Gate and Signal

    Recent American and Foreign Patents - October 4, 1873

    Answer to Correspondents - October 4, 1873

    Communications Received - October 4, 1873

    Departments

    • Letters

      Correspondence - October 4, 1873

    • Recommended

      New Books and Publications - October 4, 1873

    • Departments

      Notes and Queries - October 4, 1873

    • Business and Personal - October 4, 1873

    • Index of Inventions - October 4, 1873

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    October 04, 1873

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