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Features

Shrapnel and Shrapnel Manufacture

Fixation of Atmospheric Nitrogen

Star Clusters

The Chemical Industries of Germany—I

An Historical Review of Processes and Conditions

By Percy F. Frankland

Measurements of the Planet Saturn

The Earth Considered as a Heat Engine

A Chapter in the Thermodynamics of Nature

By George F. Becker

Automobile Lubrication—I

How to Test, and How to Use Various Classes of Oils and Greases

By C. W. Stratford

The Science of the Cipher

And an Explanation of Bacon's Undecipherable System

By William W. Brewton

A Motorcycle Street Sweeper

Coal Mined by Machines

Ancient Wax Seals

A Stop Motion for Moving Picture Machines

An Ingenious and Radical Improvement

By W. B. Morton

Lightning Rods

Unit Coal

Electrometallurgy—II

Modern Methods of Producing and Refining Various Metals

By Joseph W. Richards

Artificial Production of Caoutchouc

Considerations of Synthetic Production of an Elastic Colloidal Substance

By F. Willy Hinrichsen

Cost in Cement Manufacture

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    June 19, 1915

    Think Outside the Gift Box