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Pneumatic Dispatch

The War

The Polytechnic Association of the American Institute

New Method of Transmitting Simultaneously Two Dispatches on One Wire

Danchell's Tests for Water

Gold Coming and Going

Trap Quarries—Street Pavements

Sir William Armstrong—Is a Patent a Monopoly?

Information as to the Patentable Novelty of Inventions

A New Mode of Locomotion

Our Workshops and the War

English Shipbuilders Still Following Stevens's Floating Battery

Philadelphia Manufactures

New York Markets

Patent Claims - October 5, 1861

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    Notes and Queries - October 5, 1861

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October 05, 1861

See the World from a Different Perspective

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