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File Cutting

Hydraulic Buffer for Checking the Recoil of Heavy Guns

What is Steel ?

The East London Museum of Science and Art

W. H. Windsor's Printer's Chase

Shaw's Compound Propeller Pump

Emile Prevost's New Battery

Boiler Explosions

How to Become Bankrupt by Manufacturing

Combustibility of Diamonds--Various Effects Produced by High Temperatures

The Disposal of Sewage

The Approaching Fair of the American Institute

A New Bleaching Process

Electrical Organ Blowers and Sewing Machine Motors

The Patent Agency Business

Interesting Extension Cases--New Rules and Regulations

A New Idea in Safes

Answers to Correspondents- August 19, 1871

Queries- August 19, 1871

Recent American and Foreign Patents- August 19, 1871

Official List of Patents- August 19, 1871

Issued by the U. S. Patent Office


  • Letters

    Correspondence- August 19, 1871

  • Departments

    Business and Personal- August 19, 1871

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