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Regarding Armor and its Attack

By J. B. Van Brussel

Alcohol and Gasoline Compared

Tests Made by the United States Geological Survey

The Utilization of Meerschaum Waste

Elements of Electrical Engineering.—XVI

Alternating Current Motors. Part 2

By A. E. Watson

Wood Paving

The Photography of Color.—II

A History of Photographic Color Research and its Present Status

By Chapman Jones

Mud-Binding Grasses

The First Weather Plant Observatory

A Novel English Experiment

By Harold J. Shepstone

Interrelations of the Elements

A Summary of Recent Radioactive Investigations

By Herbert N. M*amp*apos;Coy

The Production of Smoke

With Suggestions as to its Preveention

By D. T. Randall

Steel Power Transmission Poles

A New Type of Pole for High Voltages

Thrift in America

New Method of Concrete Construction

A Novel Way of Building Small Dwellings

By C. C. Crossley

The Conservation of our Natural Resources

By Gifford Pinchot

The Latest Work on the Solar Parallax

Progress Made in a Colossal Task

By Abbe Moreux

Formation of Mineral Veins—I

Analysis of Rocfis and the Metals Extracted from Them

By Willis Eugene Everette

Engineering Notes

Trade Notes and Formulæ


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