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The Baltimore Concentric Rotary Engine

Friction of Water in Pipes

Publishers' Notice

A New Substitute for Rubber

To Europe by Balloon

The Zodiacal Light

The Greatest Gas Well in the World

Scientific and Practical Information

Improved Washing Machine

The Tunnicliffe Fire Alarm

The Gardner Governor

The Isabella Tiger Moth

From the Fourth Annual Report of Charles V. Elley, State Entomologist of Missouri.]

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

New Turkish Bath

On Girders and Floor Beams.--The Effect of Cross-Bridging

Automatic Car Coupler

Patent Ventilating and Heating Stove

Great Balloons

Recent American and Foreign Patents

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

Answers to Correspondence - July 26, 1873

Communications Received

Schedule of Patent Fees


  • Departments

    Correspondence - July 26, 1873

  • Notes and Queries - July 26, 1873

  • Business and Personal - July 26, 1873

  • Index of Inventions

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July 26, 1873

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