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Permutating Telegraph Switch

Miscellaneous Summary

New York Markets

Progress of Photography

Polytechnic Association of the American Institute

The Drill and its Office

Casting of a Great Gun--Official Report

Farmers' Club

What is Meant by the Conservation of Force

India-Rubber Once More

The Metropolitan Fair

Breech-Loading Small-Arms

The Way Inventors, Manufacturers and Consumers are Mutually Benefited

Lubricating the Steam-Engine

Recent American Patents

Patent Claims

Special Notices

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    New Books and Publications

  • Patents Granted for Seventeen Years!

  • Notes and Queries

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