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Features

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

FOSSIL SEA-SERPENTS-A CURIOUS SWIMMING

Interior of a Greenhouse

Jones' Improved Projectile for Firearms

Magnesium in Marsh's Test for Arsenic

By John C. Draper

Millener's Extension Ladder

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

By William L. Walker

The Progress of Stellar Chemistry

Chapman's Improved Saw Filing Machine

Walsh's Water Wheel Governor

A Munchausen Comet

American Art Industry

Tunnelling under City Streets and The Atmospheric Railway

Are Experimental Tests of Turbine Wheels Trustworthy?

The Common Law of Trademarks

Labor and Personal Cleanliness

Scientific and Practical Information

Measuring the Heat of Combustion

Recent American and Foreign Patents

Departments

  • From the Editor

    Answers to Correspondents - March 16, 1872

  • Letters

    Correspondence - March 16, 1872

  • Departments

    Business and Personal - March 16, 1872

  • Notes and Queries - March 16, 1872

  • Index of Inventions - March 16, 1872

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March 16, 1872

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