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Features

Guncotton and its Manufacture

An Account of Modern Methods

By Frederic L. Nathan

Tidal Power

Some Old and New Tidal Motors

By W. C. Horsnaill

The Application of Nobili's Rings to Color Photography

Transmission of Power by Ropes

Human Odors

Wild Animals in Captivity

The Zoological Gardens of New York

A Novel Electric Locomotive

A Side-Rod Electric Engine

The Astronomical Clock at Lyons

A Wonderful Timepiece

By Charles A. Brassler

The Indestructibility of Matter

Some Views on the Conservation of Mass

By G. Zenghelis

The Life of a Comet

Aerial Flight

A Summary of F. W. Lanchester's Views

An Apparatus for Studying Friction

A Description of the Derihon Apparatus

The Making of Handwriting

Is Handwriting Inherited?

By C. Ainsworth Mitchell

Radium in the Earth and its Effect

Radio-Active Deposits and the Instability of the Crust

By John Joly

The Origin of the Moon

Engineering Notes

Science Notes

Trade Notes and Formulæ

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    July 17, 1909

    Think Outside the Gift Box