SA Supplements Vol 66 Issue 1697supp

SA Supplements

Volume 66, Issue 1697supp

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Features

A $25,000 Stope Drill Prize

A Chance for American Inventors

The Theory of Diabolo

A Scientific Explanation of a Toy's Vagaries

C. V. Boys

Elements of Electrical Engineering.—XXI

Protective Apparatus

A. E. Watson

Clarifying Waste Water from Dye Works

Robert Grimshaw

Reciprocating Engines and Turbines

A Combination of the Two

C. A. Parsons, R. J. Walker

Disposal of Coaltar

The Value of Tar as a By-Product

Carroll Miller

Artificial Silk

The Making of Moving Pictures—I

How Their Fantastic Effects are Obtained

Gustave Babin

A Statistical Study of Midsummer Birds of Illinois

Mathematical Prodigies

An Explanation of Arithmetical Precocity

Methods of Fireproofing Wood and Textile Fabrics

The Aerodromometer

A Novel Cooling Installation

A Suggestion for the Tropics

A. Gradenwitz

Korn's New Telephotographic System—II

The Compensating System and Other Details of the Apparatus by the Paris Correspondent of the Scientific American

Helicopter and Aeroplane

Otto G. Luyties

Science Notes

Calculating Portland Cement Clinker

Trade Notes and Formulæ