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Features

How Coke is Made

Multiplex Telephony

By Charles S. Walden

The Behavior of Thin Aluminium Foil in Electrostatic Fields

Radioactivity and Atmospheric Electricity

By H. Geitel

How to Construct a Speaking Arc

By A. Frederick Collins

The use of Alcohol and Gasoline in Farm Engines

By C. E. Lucke and S. M. Woodward

Rate of Recession of Niagara Falls.—II

By G. K. Gilbert

Agnes Mary Clerke

By E. A. Dent

Forms for Concrete Construction

By Sanford E. Thompson

Electrical Notes

Science Notes

Trade Notes and Recipes

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    April 27, 1907

    Think Outside the Gift Box