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The Thury System of Direct Current Transmission

Special Conditions that Make its Adoption Desirable

By William Baum

Lowering Heat Losses

Marine Mines

Their Purpose: how they are Planted and how Destroyed

Cooling Electric Generators

Zehnder's Safety Roentgen-Tube

World's Production of Borax

How French Hospital Trains Help to save the Wounded

A New and Important Factor in Railroading

By Walter S. Hiatt

On the Structure of the Universe—II

The Ultimate Object of Stellar Astronomy Concluded from Scientific American Supplement No. 2084, Page 370, December 11, 1915

By H. Spencer Jones

The Tragedy of Tarawera

A Volcanic Eruption that Destroyed Many Natural Beauties

Fusible Boiler Plugs

The Critical Temperature of Mercury

Strength of Paper

Spreading a Smoke Curtain

An Artifice of Marine Warfare

The Diesel Engine

A Survey of it's Evolution as Applied to Marine Purposes

By C. Kloos


Percussive Electric Welding

Process and Machines for Uniting Similar or Dissimilar Metals

By Douglas T. Hamilton

A Substitute for Platinum-Iridium Alloy

The Conditions of Industrial Accidents

How to Increase Steam Production

What Wider Knowledge and Better Design has Accomplished

By H. Ross Callaway

A New Method of Surface Hardening

The Density of Oxygen


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December 18, 1915

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