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Pooley's Automatic Grain Weigher

Great Reduction in Cost of Steam Power--Remarkable Results

Hydraulic Cements--Their Adaptability for Useful and Ornamental Purposes

A Paper, read before the Polytechnic Association of the American Institute by Adolph Ott. PART II.

Friction Gearing Versus Belts and Cog Wheels

Mineral Waters

The Allegheny Observatory

The Attraction of the Moon

By John C. Draper

Expose of the Tricks of the Davenport Brothers

By P. H. Vander Weyde

The Modern Theory of Heat Applied to the Phenomena of Latent Heat, Combustion, Etc.

By P. H. Vander Weyde

Lewis' Twine Cutter

Sterhydraulic Apparatus

Health and Disease

What is a Machine?

Poisoning by Antimony.--The Wharton Trial

Artificial Fuel

The Agassiz Exploring Expedition--Interesting Results Already Obtained

The American Master Mechanics' Association

The Study of Alloys

To City Subscribers - January 13, 1872

Loiseau's Compressed Fuel

Hall of the Franklin Institute, Philadelphia, December 19, 1870.

Applications for Extension of Patents

Recent American and Foreign Patents

Under this heading we shall publish weekly notes of some of the more prominent home and foreign patents.


  • From the Editor

    Answers to Correspondents - January 13, 1872

  • Letters

    Correspondence - January 13, 1872

  • Recommended

    New Books and Publications - January 13, 1872

  • Departments

    Business and Personal - January 13, 1872

  • Notes and Queries - January 13, 1872

  • Index of Inventions - January 13, 1872

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