Volume 24, Issue 4
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Features
Xylonite
By Daniel Spill, before the London Photographic Society, Dec. 18, 1870.
The Triumphs of Surgery
Perpetual Motion- January 21, 1871
Number VIII.
Improved Door Guard
Post-Hole Borer
Wire Stretcher for Fence Building
Shoemaker's Tool
Intrenching Tool
An Idle Day at Fall River, Mass
What Ought a Mechanic to Know?
Railroad Monopolies
Facts and Figures about the Mont Cenis Tunnel
The U.S. Signal Service and Storm Signals
Vapor Lamps and Vapor Stoves
New Chemical Products
American Gas Wells
Progress of Foreign Invention
Important Patent Decision- January 21, 1871
Answers to Correspondents- January 21, 1871
Recent American and Foreign Patents- January 21, 1871
Under this heading we shall publish weekly notes of some of the more prominent home and foreign patents.
Applications for Extension of Patents- January 21, 1871
Official List of Patents- January 21, 1871
Issued by the U. S. Patent Office for the Week Ending Jan. 10, 1871. Reported Officially for the scientific American.