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Ventilated Cooling Apparatus

Editorial Correspondence

Villard's Rotating Chimney Cap

The Allen-Porter-Whitworth High-Speed Engine

Machine Tools at the Exposition

Facts About Explosions of Steam Boilers

The Sampson Scale

New Publications

The Paris Exposition--Official List of the Awards to American Exhibitors

Recent American and Foreign Patents

Editorial Summary

Business and Manufacturing Items

Answers to Correspondents

Malleable Cast Iron

Sources of National Importance

Rights of Property in Inventions

Practical Mechanics as Visitors to the Great Exposition

Persistence the Essential Element of Success

Notice to Subscribers

Patents and Claims

King's Spring Fishhook and Trap

State of the Patent Office


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July 13, 1867

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