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Features

The Properties of Selenium and their Applications in Electrotechnics—II

By Erich Hausmann

Motion Pictures for Selling Machinery

The Kola Tree and its Seed

A Plant of Varied Utility

Incandescent Gas Mantles of Artificial Silk

An Important Application for the Synthetic Fiber

The Earninǵ Power of Chemistry

The Bessemer Process has Added Two Billion Dollars Yearly to the World's Wealth

By Arthur D. Little

The Rate of Growth of the Human Hand

The Creusot Iron Works

A Visit to the Great French Foundry. By Our Paris Correspondent

The Gas Power Field for 1911

A Review of the Past Year

By Robert H. Fernald

Sanitation of Swimming Pools

Siǵnal System at Pennsylvania Station, New York

A Passenǵer Cableway on Mont Blanc

An Easily Constructed Tesla Coil

Instructions for the Amateur Electrician

By Allan S. Dana

Automatic Telephone Exchanǵe Systems—III

A Survey of the Present State of the Art

By W. Aitken

Larǵe Glass Sand Deposit

Materials for Paper Money

Science Notes

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    January 27, 1912

    Think Outside the Gift Box