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The Subway Muddle, Necessity and Invention and more

George Ellery Hale

By Frederick Slocum of the Yerkes Observatory Staff America's Foremost Solar Physicist

How to Find your Way in the Air

Aeronautical Signals; Aeronautic Charts; Steering by Compass

Naval Aviation, Advanced Study in Electrical Engineering at the Massachusetts Institute of Technology and more

By W. Irving Chambers

Sailing the Seven Seas in a "Cockleshell"

Two Diminutive Yawls Have Dared the Dangers of the Atlantic and Pacific Oceans

Automobile Novelties

A Motor Car for Assayers; Psychological Tests for Chauffeurs

Psychological Apparatus for Testing Chauffeurs

By Ralph Bergengren

Abstracts from Current Periodicals

Phases of Science as Other Editors See Them

A Simple Vise

By B. Francis Dashiell

Nail-holder for Claw-hammers

By W. J. C

Reducing the Size of Tubing

By F. C. I.

Centering and Reboring Engine Cylinders in a Lathe

By H. C. Urbaner

Some Oddities in Joints

By W. D. Graves

A Good Substitute for a Drill Post

By R. C. D.

The Inventor's Department - July 8, 1911

Simple Patent Law; Patent Office News; Inventions New and Interesting

How I Invented the Air Brake--IV, Notes for Inventors and more

By George Westinghouse

Railway Building in Asiatic Russia: Paris-Peking in Nine and a Half Days


  • Letters

    Correspondence - July 8, 1911

  • Recommended

    New Books, Etc. - July 8, 1911

  • Departments

    Recently Patented Inventions - July 8, 1911

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