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Recent Improvements in Torpedo Warfare

Invention the Mother of Necessity

Publishers' Notice

Underground Railways in American Cities

Street Travel

Boilers and Boiler Owners

Snake Poisons

Notes from the Vienna Exposition

Cummings' Steam Mowing, Reaping, and Thrashing Machine

Specific Gravity Indicator

Electric Gas Lighter

New Form for Metallic Telegraph Poles

En Route to the Great Exposition Number 2.--Letter from United States Commissioner Professor R. H.Thurston

The Great Leopard Moth

Improved Cultivator

A New Fire Escape

Novel Claw Hatchet

An Improved Horse Collar Brace

New Heel Plate for Boots and Shoes

Robert Wilhelm Bunsen

The New Electric Light in London

Light and Life

To Europe in a Balloon

Recent American and Foreign Patents

Value of Patents, and How to Obtain Them Practical Hints to Inventors

Answers to Correspondents

Communications Received - July 19, 1873

Schedule of Patent Fees

To Investors - July 19, 1873

Scientific American - July 19, 1873


  • Departments

    Correspondence - July 19, 1873

  • Business and Personal - July 19, 1873

  • Notes and Queries - July 19, 1873

  • Index of Inventions - July 19, 1873

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