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The Future Water Supply of New York City

Mining and Manufacture of Rock-Salt

The North Sea Fisheries

The Apprenticeship System

By William P. Smythe

The Fuels Competition of the Automobile Club of France

Improved Machinery for Wheel Making

A New Form of Friction Clutch

The Summer Meeting of the Iron and Steel Institute


Radio-Activity—the Secret of Radium's Light and Heat

The Modern Craft of Metal Working

By Day Allen Willey

A Correction

The Influence of Brain-Power on History

Sir Norman Lockyeh'S Presidential Address to the British Association

Contemporary Electrical Science

The Steel-Frame Side-Door Passenger Car Built by the Illinois Central Railroad Company

The Bird Life of Autumn

By Frederick A. Ober

The Vickers-Maxim Dismountable Gun

Electrical Notes

Engineering Notes

Trade Notes

Trade Suggestions from United States Consuls

Selected Formulæ



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