Volume 24, Issue 20
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Features
Solutions for Silver Plating
The Sea-Horse
The Cochineal Insect and Its Allies
Mitchell & Kessinger's Improved Flour Bolt
G. K. Proctor's Improved Treadle Motion
Improved Turbine Water Wheel
The Erie Canal
The Blowpipe as an Aid to the Drill in Opening Safes
Pipes for Domestic Water Service
Inventions Made by Workmen--Who Owns Them?
On a Method of Determining the Percentage of Water Mechanically Suspended in Steam Delivered from Boilers which Prime
Scientific Intelligence- May 13, 1871
Important Decision by the Commissioner of Patents
Health in Old Age
Important Decision of the Commissioner of Patents--Trade Mark Patents
Refuse and Waste
Recent American and Foreign Patents- May 13, 1871
Answers to Correspondents- May 13, 1871
Queries- May 13, 1871
Applications for Extension of Patents- May 13, 1871
Official List of Patents- May 13, 1871
Issued by the U. S. Patent Office