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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 Wrench

The Horticultural Building

An Improved Velocipede

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

  • Notes and Queries- July 18, 1891

  • Business and Personal- July 18, 1891

  • Index of Inventions- July 18, 1891

  • To Inventors- July 18, 1891

  • Patents!- July 18, 1891

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July 18, 1891

Beyond XX and XY

Biology. Identity. Equality.

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