Volume 105, Issue 2
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Features
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
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
Abstracts from Current Periodicals
Phases of Science as Other Editors See Them
Nail-holder for Claw-hammers
A Good Substitute for a Drill Post
Some Oddities in Joints
Centering and Reboring Engine Cylinders in a Lathe
Reducing the Size of Tubing
A Simple Vise
The Inventor's Department - July 8, 1911
Simple Patent Law; Patent Office News; Inventions New and Interesting