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Effect of the War on the World's Shipping

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

By James L. Breese

The Romance of Invention--I

In 1876, One Patent; In 1919, Eleven Million Telephones

By C. H. Claudy

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

The Current Supplement

New Process for Cleaning Locomotives, The Percussion Cap and more

Rare Elements as Paint Pigments

By Henry A. Gardner


  • Departments

    Correspondence - July 19, 1919

  • The Service of the Chemist

  • The Motor-Driven Commercial Vehicle

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