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Features

We Build a Locomotive on the Metric System

How the Law May Prevent Railroad Accidents

Another Long-Distance Transmission in California

Tinol

Brunel and the Seven-Foot Gage

Result of the Motor Boat Race to Bermuda

Automobile Races and Record Runs

A Telephone Newspaper

By W. G. Fitz-Gerald

The Government Tests of Submarines

The Wellman Polar Airship Expedition

By the Paris Correspondent of the Scientific American

Double-Deck Streets as a Relief for Traffic Congestion

The Art and Craft of the Medalist

By Victor D. Brenner

Mechanical Masterpieces of the Eighteenth Century

By Alfred Gradenwitz

An Artificial Respirator

By John W. Hall

Do Animals Reason?

By L. A. Camacho

Spark-Producing Mechanism for Explosion Engines

An Improved Clothes Line Hanger

A Novel Pneumatic Massage Machine

Novel Safety Razor

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June 22, 1907

See the World from a Different Perspective

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