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A Call for the Automatic Stop, Do You Want an Airship? and more

Twelve Hundred Charts at a Third of a Cent

A Few Words About a Necessary Expenditure for Which Congress Has Failed to Provide

By C. H. Claudy

When Humpty-Dumpty Travels

By Harry A. Mount

The Why of Luminous Paints

By M. A. Henry

Making the Most of Niagara

Projects Looking to the better Utilization of This Great Water Power

By Robert G. Skerrett

A Problem of Electric Drive

The Advantages of the Diesel-Electric System Over the Straight Diesel Drive

Jobs for Sawdust

Some of the Useful Ends to Which This Waste Material Is Being Put

By S. R. Winters

The Musical Hospital

How Flattened and Fractured Brass, Wood and Stringed Instruments Are Repaired

By Albert A. Hopkins

An Extinct Sea Lizard from Western Kansas

By Charles W. Gilmore

Optical Tricks with Electric Sparks, Reclamation Project in Northeastern Brazil

By W. A. Kimball


  • Departments


  • The Heavens in April, 1921

  • Inventions New and Interesting

  • Recently Patented Inventions

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