Volume 24, Issue 16
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Features
The Patent Laws
The Ivory Plant
Triangular Suspension Bridge
Boring for Oil
Improved Power Hoisting Machine
Instruments used in Storm Signal Service
Furrowing Hammer for Stone Dressing
Pisciculture in New York and New Jersey
Firing of Steam Boilers
Iron Rails for Common Roadways
Artificial Stone
The Battle of the Tires
Employment of Females in New York
Suggestions for the Improvement of Railways
Queries- April 15, 1871
Scientific Intelligence- April 15, 1871
Answers to Correspondents- April 15, 1871
Recent American and Foreign Patents- April 15, 1871
Official List of Patents- April 15, 1871
Issued by the U. S. Patent Office