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Electric Furnaces for Heating Steel—I

Facts and Figures Relating to New and Valuable Methods

By Alcan Hirsch

Handling Rails Cheaply

Coffee-Growing in Paraguay

The Arrow Rock Dam

By Chas. J. Lisle


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

Red as a Danger Indication

The Value of Various Colors for Signaling Purposes

By William Churchill

Belgium's War Dogs

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

Ideal Form for Fast Airships

The Spectrum Extended in Extreme Ultra-Violet

Drying Grain by Electricity


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    November 28, 1914