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Features

A New Type of Ferryboat, Rings Bell if Water is Found in Gas and more

A New Profession

The Recreation Engineer and his Part in Making Our Vacations Worth While

By Avis Gordon Vestal

Copper-Fouling of Ordnance Materials

By A. Dagory
Philadelphia's Tear Bombs and Mobs
The Sciences

Philadelphia's Tear Bombs and Mobs

By William A. McGarry

A Problem in Levels

How the Shafts and Workings of Coal Mines Are Kept Free of Water

By J. F. Springer

The Lesson of the ZR-2 Disaster

Some Recent Facts Bearing on the Construction and Tests and the Conclusions Drawn Therefrom

By Ladislas d'Orcy

Group Medicine

A Recent Development in Medical Practice Which Groups Specialists for Diagnosis and Treatment

By Mary Ethel Jameson

Fish Stories that are Stranger than Fiction

Queer Creatures of Ocean and River on Daily Sale in Out-of-the-Way Corners of New York

By L. Lodian

When Electricity Fires the Enamel Ware

How the Electric Furnace has been Introduced in the Art of Vitreous Enameling with Excellent Results

By C. W. Mehling and Jas. W. Carpenter

Dyes for China

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    Correspondence

  • The Motor-Driven Commercial Vehicle

  • Recently Patented Inventions

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September 1921

Think Outside the Gift Box