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    Features

    Diamond Cutting by Hand and Machine

    The Caldera Naval Fight

    The Commissionership of Patents

    The Disposition of Mining Debris in California

    Progress of the North River Tunnel

    An Improved Velocipede

    The Horticultural Building

    An Improved Wrench

    A Power Hack Saw

    Photographic Notes- July 18, 1891

    Valley's Railroad for Lumbermen etc.

    Science in the Theater

    Permanent Steam Engine Indicator

    Departments

    • Letters

      Correspondence- July 18, 1891

    • Recommended

      New Books and Publications- July 18, 1891

    • Departments

      Recently Patented Inventions- July 18, 1891

    • Business and Personal- July 18, 1891

    • To Inventors- July 18, 1891

    • Index of Inventions- July 18, 1891

    • Notes and Queries- July 18, 1891

    • Patents!- July 18, 1891

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    July 18, 1891

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