Volume 25, Issue 5
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Features
Writers on Science
Utility of Patent Laws
Discussion on Mr. Harding's Paper, "Entitled The Application of Steam to Canals" Concluded in Our Issue of July 15.--No. 2
New Mechanical Movement
Crocker's Whiffletree Coupling
Belt Holes--Quarter Turned Belts
Reminiscences of Inventors
Baer's Door Fastener
The Spectroscope and its Applications
Our Correspondence
The Erie Canal Navigation Problem
Scientific Intelligence- July 29, 1871
Answers to Correspondents- July 29, 1871
Queries- July 29, 1871
Recent American and Foreign Patents- July 29, 1871
Official List of Patents- July 29, 1871
Issued by the U. S. Patent Office