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Watts and Phelps' Variable Cut-off, French Ironing Table

The Triumphs of Surgery


By Daniel Spill, before the London Photographic Society, Dec. 18, 1870.

Perpetual Motion- January 21, 1871

Number VIII.

Improved Door Guard

Shoemaker's Tool

Wire Stretcher for Fence Building

Post-Hole Borer

Intrenching Tool

An Idle Day at Fall River, Mass

Facts and Figures about the Mont Cenis Tunnel

Railroad Monopolies

What Ought a Mechanic to Know?

American Gas Wells

The U.S. Signal Service and Storm Signals

Vapor Lamps and Vapor Stoves

New Chemical Products

Progress of Foreign Invention

Important Patent Decision- January 21, 1871

Answers to Correspondents- January 21, 1871

Applications for Extension of Patents- 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.

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.


  • Letters

    Correspondence- January 21, 1871

  • Recommended

    New Books and Publications- January 21, 1871

  • Departments

    Business and Personal- January 21, 1871

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The Essential Guide to the Modern World

The Essential Guide to the Modern World