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The Electric Piano Player

Its Development and Construction

By John F. Kelly

The New Automobile Steels.—II

Their use in MotorCar Construction

By John A. Mathews

The Action of Sea Water on Cement Concrete

A Curious Collection of Bottles

Relics of a Bygone Industry

By Ada Walker Camehl

The Fixation of Atmospheric Nitrogen

DirrelandEyde Process

By Sam Eyde

Putting a Piece in a Belt

What a very small Telescope will Do

Suggestions for the Amateur Astronomer

By Arthur Mee

The Record Flight of ”Zeppelin II.”

Further Details of This New Airship's Record Journey and a Full Account ofIts Accident

Radio Activity and Mineral Hues

Influence of Radium and Ultraviolet Rays Upon the Color of Minerals

By C. Doelter

Atmospheric Influences Causing Movements of the Soil


New Formulas and Processes

By F. Hartmann

Science Notes

Trade Notes and Formulæ

Engineering Notes


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