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Features

Permutating Telegraph Switch

Miscellaneous Summary

New York Markets

Polytechnic Association of the American Institute

Progress of Photography

The Drill and its Office

Casting of a Great Gun--Official Report

Farmers' Club

Breech-Loading Small-Arms

What is Meant by the Conservation of Force

The Metropolitan Fair

The Way Inventors, Manufacturers and Consumers are Mutually Benefited

India-Rubber Once More

Lubricating the Steam-Engine

Patent Claims

Special Notices

Recent American Patents

To Our Readers

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March 19, 1864

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