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Method of Constructing Tunnels Vaults Etc., Quinine, and more

Causes of Steam Boiler Explosions Unsafe Character of Tubular Boilers

Trials of Breech-Loading Rifles. Competition, 1867

A Quartette of Mathematical Gymnasts

A. S. Lyman's Patent Accelerating Rifle

Gleanings from the Polytechnic Association

Recent American and Foreign Patents

Manufacturing, Mining and Railroad Items

Answers to Correspondents

A Deep Coal Mine, with a Description of its Pumps, Winding Engine, Etc.

Fair of the American Institute

Mechanical Possibilities and Impossibilities

The Paris Safe Trial, A Farce

The Swedish Coast Defense Monitors--A Novel Craft

Are Our Feet Properly Clothed?

Patents and Claims

Return of Commissioner Wells

Pending Applications for Reissues

Extension Notices


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