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Features

The Hudson River Pontoon Bridge, Inventing a Crime and more

Railroading Under Roof

Where the Severity of the Weather Practically Makes Transportation an Indoor Game

By Charles Frederick Carter

Clean Water for the Power Plant

By George T. Holmes

Saving St. Paul's in London

By M. Macartney

Getting the Rest of the Oil

Laboratory Tests that Reveal the Underground Secrets of the Petroleum Field

By Robert G. Skerrett

Starving in the Midst of Plenty

Present Knowledge Regarding the Cause and Cure of Pellagra

By Robert G. Skerrett

Proposed Hudson River Pontoon Bridge

An Emergency Measure to Meet Severe Automobile Congestion

The Captive Helicopter

Details of the Remarkable Machine Developed by an Austrian Army Officer

Enemies of Timber Construction

Some of the Insects that Prey on Piles and Beams, and the Extent of their Depredations

By J. F. Springer

An Ancient Art in Modern Dress

How the Potter Does, by Machine, the Same Things His Ancestors Did by Hand

By M. O. Goldsmith

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August 1921

See the World from a Different Perspective

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