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Features

Electric Furnaces for Heating Steel—I

Facts and Figures Relating to New and Valuable Methods

By Alcan Hirsch

The Arrow Rock Dam

By Chas. J. Lisle

Handling Rails Cheaply

Coffee-Growing in Paraguay

Calorizing

A Protective Treatment for Metal

By H. B. C. Allison and L. A. Hawkins

The Resistance to a Ship's Motion

As Determined Experimentally by Means of Models in Special Tanks

What an Incompetent Workmen Costs

Producer Gas from Low Grade Fuels

Cheap Power from Fuels Not Heretofore Considered Economical

Belgium's War Dogs

Red as a Danger Indication

The Value of Various Colors for Signaling Purposes

By William Churchill

Ben Franklin Vindicated

The New York Fire Alarm System

By Putnam A. Bates

Stereoscopic Drawing

A Training for Accurate Workmanship

By Charles E. Benham

An Historical Sketch of the Gas Engine

Tracing the Origin and Development of Different Types

By John Hays Hammond

Drying Grain by Electricity

Ideal Form for Fast Airships

The Spectrum Extended in Extreme Ultra-Violet

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    November 28, 1914

    Beyond XX and XY

    Biology. Identity. Equality.