Volume 105, Issue 4
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Features
The Winning of the International Aviation Trophy
How Weymann Upheld Our Colors Single-handed and Won the World's Greatest Speed Event
The Beacon Hill Tunnel
How a Half-mile of the Boston Subway Was Built In Tunnel
A Comparison of the German and American Navies
Our Great Superiority in Gun-fire Places the United States in the Lead.
Henry Fairfield Osborn
America's Foremost Palaeontologist
The Latest of the Big Railway Terminals
The Chicago Terminus of a Leading Western System
Heart Diagnosis by Electricity
Abstracts from Current Periodicals- July 22, 1911
Phases of Science as Other Editors See Them
An Improvised Bobbin Winder
A Simple Turnbuckle
Home-made Anchors
Adz-tightener
Making a Wooden Tube
Turning Ball Joints to Gage
The Inventor's Department- July 22, 1911
Simple Patent Law; Patent Office News; Inventions New and Interesting