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Features

Denatured Alcohol from Currants

Malleable Castings by a New Process

Melting Wrought Scrap in the Crucible and in the Open Hearth Furnace

Washing and Coring Tests of Coal

Some Experiments Made by the Geological Survey

Green Ammonio-Citrate of Iron for Preparing Blue-Print Paper

By Randolph Bolling

Elements of Electrical Engineering.—xvii

Transformers and Transformer Systems

By A. E. Watson

The Edison Concrete House

The Practical Problems Involved

By Percy H. Wilson

Brazilian Copal Gum

The Eye of Mathematics

What the Trained Imagination Can Do

By Cassius J. Keyser

Ozone in a German Theater

Losses Resulting from Bad Weather

The Colburn window-Glass machine

The First Machine for Drawing Window Glass Continuously in any Width

Magnitude of the Lighting Industries

A Review of a Great industry

By E. L. Elliott

Gases and Vapors

A Simple Statement of Their Phenomena

By O. N. Witt

Life of a Radio-Active Element

By A. T. Cameron

The Cornu Helicopter

How this Novel Type of Flying Machine was Developed

Formation of Mineral Veins.—iii

The Magmatic and Meteoric Methods

By Willis Eugene Everette

How the Earth is Weighed

The Mighty Mathematical Scales of Physics

By Poynting

Theory of the Mirage

Trade Notes and Formulæ

Electrical Notes

Engineering Notes

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    May 16, 1908

    Think Outside the Gift Box