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Features

The Chicago Waterworks

“Patent Perfidy.”

Ozone and the Sanitology of Odors

The Date of the Glacial Era in Eastern North America

The National Academy of Sciences

Photophonic and Spectrophonic Discoveries

Public Works in New York City

Improvement in the Construction of Fences and Posts

Recent Decisions Relating to Patents

Improvement in Animal Shears

Improvement in Water Elevators

Improved Optometer

Miscellaneous Inventions - May 7, 1881

Manufacture of Real Lace by Machinery

Agricultural Inventions - May 7, 1881

Coffee.--its Uses and Medicinal Qualities

By Henry Segur

Departments

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    Correspondence - May 7, 1881

  • Notes and Queries - May 7, 1881

  • Business and Personal - May 7, 1881

  • New Books and Publications - May 7, 1881

  • Index of Inventions - May 7, 1881

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May 07, 1881

Complex Causes. Alternative Solutions.