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Features

The Cannon Falls Hydro-Electric Development

Designed for an Ultimate Capacity of Three Thousand Horsepower

The Psycholoǵy of Liǵht—II

The Subjective Aspect of Optics

By R. S. Woodworth

New Method of Testinǵ Rails

A Simple Impact Trial

The Power Required to Cut Steel

The Influence of Chemical Composition and Previous History

By P. V. Vernon

Developinǵ a small Water Power Plant

Electric Power for the Farm and Country House

Cheddar Cheese Making

A Phase of Dairy Industry

By G. C. Sawyers

Skis; Their Construction and Use

The Making of a Good Ski is a Delicate Task

The Sewer System of Havana

How the United States Have Fulfilled Their Responsibility

By G. C. Scherer

Wheels, Ancient and Modern and their Manufacture—I

From Tree-trunK Roller to Wire-spoke Motor Car Wheel

By Henry L. Heathcote

Speed Measurement in Zeppelin Diriǵibles

Condiments and Stimulants

They Represent Lubricants,Not Motive Power

Electric Burns and their Treatment

Rules Governing the Competition for the $15,000 Flyinǵ Machine Prize Offered

By Edwin Gould

Science Notes

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    December 23, 1911

    Think Outside the Gift Box