Volume 121, Issue 3
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Features
The Airship of the Near Future, The Romance of Invention and more
Precautions that Spelled Success
Some Engineering Features of the First Flight Across the Ocean
The Romance of Invention--I
In 1876, One Patent; In 1919, Eleven Million Telephones
The Trans-Atlantic Dirigible
Some Impressions of the Dirigible R-34 and of Lighter-than-Air Craft in General
A Millionth of an Inch
How the Wave-Length of Light is Used to Detect Errors of this Infinitesimal Amount