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Editorial Correspondence

Ventilated Cooling Apparatus

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

Recent American and Foreign Patents

Editorial Summary

Business and Manufacturing Items

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

Answers to Correspondents

Malleable Cast Iron

Rights of Property in Inventions

Notice to Subscribers

Sources of National Importance

Persistence the Essential Element of Success

Practical Mechanics as Visitors to the Great Exposition

Patents and Claims

State of the Patent Office

King's Spring Fishhook and Trap


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July 13, 1867

Confronting Common Wisdom