Volume 123, Issue 26
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Features
The Progress of the Einstein Judges, Are we to Become the War Pace-Maker? and more
Our Lagging Gold Production
Reasons Why Less of the Precious Metal Is Being Produced Now Than for Many Years Past
How Hard is a Rock?
The North Platte Project Today
Why the Cliff Dwellers Vanished
A Modern Industrial Hazard that May Have Existed in Prehistoric Times
The New President of the American Association
Disposing of the Sewage
A Typical Plant at Mount Vernon, N. Y., with Special Features of Interest in Overhead Distribution
A New American Industry
How the Making of Toys Has Been Established on a Solid Basis in This Country
Old 999 Still in Service
With the Engineers of Industry
A Department Devoted to the Physical Problems of the Plant Executive