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Another Faraday Wanted

Interesting Naval Information by the Secretary of the Navy

Columbian Fair Progress

A Combined Bath And Wash Tub

An Improved Index

Improved Sounding Bridge for Pianos, Etc.

A Heater for use with a Gas Burner

An Improved Package Tie

A Centenarian

A Standard Bicycle

New Fire Boat for New York City--The New Yorker

Photographic Notes- March 7, 1891

The Pennington Air Ship

An Efficient Pipe Cutting Machine

A Stopping and Signaling Mechanism for Locomotives

The Proctor Tower

An Ancient Water Elevator

Scientific American Building Edition- March 7, 1891

The Scientific American


  • From the Editor

    To Inventors- March 7, 1891

  • Letters

    Correspondence- March 7, 1891

  • Recommended

    New Books and Publications- March 7, 1891

  • Departments

    Notes & Queries- March 7, 1891

  • Recently Patented Inventions- March 7, 1891

  • Business and Personal- March 7, 1891

  • Index of Inventions- March 7, 1891

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March 07, 1891

Beyond XX and XY

Beyond XX and XY

Biology. Identity. Equality.