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A $25,000 Stope Drill Prize

A Chance for American Inventors

The Theory of Diabolo

A Scientific Explanation of a Toy's Vagaries

By C. V. Boys

Elements of Electrical Engineering.—XXI

Protective Apparatus

By A. E. Watson

Clarifying Waste Water from Dye Works

By Robert Grimshaw

Reciprocating Engines and Turbines

A Combination of the Two

By C. A. Parsons and R. J. Walker

Disposal of Coaltar

The Value of Tar as a By-Product

By Carroll Miller

Artificial Silk

The Making of Moving Pictures—I

How Their Fantastic Effects are Obtained

By Gustave Babin

A Statistical Study of Midsummer Birds of Illinois

Methods of Fireproofing Wood and Textile Fabrics

The Aerodromometer

Mathematical Prodigies

An Explanation of Arithmetical Precocity

A Novel Cooling Installation

A Suggestion for the Tropics

By 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

By Otto G. Luyties

Trade Notes and Formulæ

Science Notes

Calculating Portland Cement Clinker


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