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Colt's Armory Testing Machine, Railway Power Brakes

Interesting Lecture by Professor Tyndall—The Identity of Light and Radiant Heat

The New York Fire Alarm Telegraph

Printing the Patent Drawings

The Yale Exploring Expedition of 1871


Interior of a Greenhouse

Jones' Improved Projectile for Firearms

Millener's Extension Ladder

Magnesium in Marsh's Test for Arsenic

By John C. Draper

The Color of the Gulf Stream, and Its Excess of Solid Matter Accounted For

By William L. Walker

The Progress of Stellar Chemistry

Walsh's Water Wheel Governor

Chapman's Improved Saw Filing Machine

The Common Law of Trademarks

Are Experimental Tests of Turbine Wheels Trustworthy?

American Art Industry

A Munchausen Comet

Tunnelling under City Streets and The Atmospheric Railway

Scientific and Practical Information

Measuring the Heat of Combustion

Labor and Personal Cleanliness

Recent American and Foreign Patents


  • From the Editor

    Answers to Correspondents - March 16, 1872

  • Letters

    Correspondence - March 16, 1872

  • Departments

    Notes and Queries - March 16, 1872

  • Business and Personal - March 16, 1872

  • Index of Inventions - March 16, 1872

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March 16, 1872

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