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And the Permanency of the North Atlantic Ocean Bottom

By Charles Schuchert

A Ten-Inch Diffraction Grating

By A. A. Michelson

The Problem of the Crippled Soldier

How to Put Him on the Pay Roll

By Frank B. Gilbreth and Lillian M. Gilbreth

Iron for Electrical Machinery

The Limitations of Stained Glass

A Comparison of Ancient and Modern Methods

By R. C. Bayne

The Self-Made Troubles of a Deer

Liquid Fuel

Carving in Wood

The Oldest Art of the Human Race

Motor Agricultural Work in France

Tungsten Ores in Malaya

The use of Supplementary Lenses

Engineering Precautions in Radio Installations

Various Possible ' Dangers and Means for a voiding Them

By Robert H. Marriott

A One-Quarter Horse-Power Single-Phase Induction Motor—I

Complete Details and Instructions for Building

By Charles F. Fraasa

The Function of Pressure in Chemical Problems

An Important Field for Further Research

By E. Briner

An Air Meter for the Rand


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