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The New Nile Barrage at is N A

The English Correspondent of the Scientific American How Egypt's Scarcity of Water is Overcome

Power Estimating for Turbine Steamers

How the New Problems Are Solved

Direct vs Single-Phase Currents

A Cpmparison of Costs

Electric Traction on Prussian Railroads

A New Ball Worm Gear

A Device for the Direct Driving of Automobiles

By W. H. Booth

An Odorless Gasoline Motor

A New Three-Cycle Engine

The Soda Industry

New Metallurgical Products

Theory of Freezing Mixtures and heir Chemistry

By T. Chalkley Palmer

Recent investigations in Radio-Activity

A New Railway Dynamometer Car

Testing Rolling Stocr on an English Road by the English Correspondent of the Scientific American

The Manufacture of Bessemer Steel Rails

By Franklin E. Abbott

What is a Chemical Engineer?

Plant Breeding

Its Fundamental Principles

By Luther Burbank

The Webster Ruin in Southern Rhodesia

Interesting ArchæOlogical Relics

Radium Emanation and Transmutation'

The Chemical Action of Radium Emanation on Copper and Lead and on Water

By Alexander Thomas Cameron and William Ramsay

Agricultural Uses of Crude Ammonia

By Emile Bouant

Engineering Notes

Trade Notes and Formulæ

Phosphorescence at Low Temperatures


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