Volume 104, Issue 21
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Features
"Ehrlich-Hata 606"
How It was Discovered
American Ideas in British Battleships
The "Monarch"--a Modified "North Dakota"
The Restoration of Documents Charred by Fire
How Automobile Numbers are Concealed
Automobile Novelties
New Things in America and Europe
The Beff Electric Tricycle
The Variable Speed Aeroplane
Some Ingenious Designs
The Seventeen-year Locust or Periodical Cicada
The Two Races and When They Appear
Forests and Water Supply
Rules Governing the Competition for the $15,000 Flying Machine Prize Offered
The New York Public Library
How the Readers and the Books are Distributed in the New Building
How to Insert Small Screws
The Handy Boatman
The Inventor's Department - May 27, 1911
Simple Patent Law; Patent Office News; Inventions New and Interesting