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Features

Geographic Aspects of the War—I

How Topographical Conditions Affect Military Operations

By Douglas Wilson Johnson

Some Rare Amphibians

Valuable New Specimens at the New York Zoological Park

By Raymond L. Ditmars

When to Clean Turbine Blades

How a Top Stands Up

A Simple Explanation of a Frequently Recurring Phenomenon

By J. Swinburne

Nickel-Plating on Aluminium

Isostasy and Mountain Building

How the Depressions and Eminences Upon the Earth's Surface Were Formed

By Luigi de Marchi

Drilling for Oil

Improved Engineering Methods

Imitation Precious Stones

Photographic Maps

Methods of Producing Correct Charts with the Camera

Magnetization by Rotation

Control and Protection of Electric Systems

Problems that Have Arisen with Increase of Power and Extension of Circuits

By Charles P. Steinmetz

The Synthetic Production of Nitric Acid

The Manufacture of Liquid Air

Methods Employed and the Development of Machinery Now Used

The Movements of the Moon

Mental Tests of Dementia

A Consideration of Various Doctrines and Results of Some Investigations

By Bernard Hart and C. Spearman

The use of Aluminium in War

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    September 25, 1915

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