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Features

Caissons for Pier-Building

Objects of Interest on a Guano Island

Effect of Magnetism on Time-Pieces

On Ropemaking

The Diamond Bone Mill

The Shad Fisheries of the Hudson

Adverse Report on the East River Bridge

A New Lamp Extinguisher

Small Inventions Most Profitable

Obituary—Death of John A. Roebling

Currency Reform Needed—How it May be Accomplished

Balancing Heavy Cylinders

Joshua Shaw, Artist and Inventor—The Early History of the Copper Percussion Cap

Manufacturing, Mining, and Railroad Items

Calculation of the Amount of Ice Which Can be Produced From a Given Amount of Coal in the Modern Ice Machine

By P. H. Vander Weyde

Answers to Correspondents

Recent American and Foreign Patents

Official List of Patents

Issued by the United States Patent Office

Applications for Extension of Patents

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    Correspondence

  • Business and Personal

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