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Features

Improvements in the Cable Railway of the New York and Brooklyn Bridge

Salida Springs and Mines, Zirconia Minerals, and more

Hiram Sibley

The Projected Tunnel between France and England

A Waterproof Lining for Cellars

An Improved Drawing Instrument

An Improved Nut Lock for Valves

A Safety Seal for Checks, Bonds, Etc.

New Chromatrope

An Improved Wrench

Temminck's Chelydra

Tire Furnace

Simple Apparatus for Illustrating Newton's Second Law

Simple Experiments in Physics

By M. Hopkins

Agricultural Inventions - July 21, 1888

Engineering Invention - July 21, 1888

Miscellaneous Inventions - July 21, 1888

To Inventors - July 21, 1888

Departments

  • Letters

    Correspondence - July 21, 1888

  • Recommended

    New Books and Publications - July 21, 1888

  • Departments

    Notes and Queries - July 21, 1888

  • Business and Personal - July 21, 1888

  • Index of Inventions - July 21, 1888

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July 21, 1888

Beyond XX and XY

Biology. Identity. Equality.