SA Supplements Vol 72 Issue 1877supp

SA Supplements

Volume 72, Issue 1877supp

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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

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

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

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

G. C. Scherer

Wheels, Ancient and Modern and their Manufacture—I

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

Henry L. Heathcote

Condiments and Stimulants

They Represent Lubricants,Not Motive Power

Speed Measurement in Zeppelin Diriǵibles

Electric Burns and their Treatment

Science Notes

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

Edwin Gould