Features
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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Business and Personal
