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Features

Population of the American Colonies

Exploring the Great Wall of China

By William Edgar Geil

The Smoke Nuisance and the Railroads

Considered from the Economical and Geological Standpoint

By A. W. Gibbs

A Year's Experience with a Suction Power Plant

Eiffel Tower Device for Showing Hour

The Time Indicator of Paris

Definitions of Electrical Terms

New Dust Preventives

The use or Water and Salt Solutions

By Prevost Hubbard

“Ferro-Bronzes”

Some New Alloys and their Composition

By Robert Grimshaw

A New System of Welding

Radium Rays and Plant Life Processes

Some Interesting Discoveries

By C. Stuart Gager

Artificial Gems Past and Present

Imitating Nature in the Laboratory

By Emil Freund

A Simple Vapor Pressure Apparatus

By E. J. Rendtorff

Sub-Aqueous Photography.—II

Photographing Aquatic Animals in their Natural Environment

By Jacob Reighard

Animal Fats and Oils

Some Manufacturing Processes

By W. H. Bentley

The Passing of the Whale

Engineering Notes

Electrical Notes

Trade Notes and Formulæ

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April 24, 1909

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