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The Southwest African Railway

By Alfred Gradenwitz

Margin for Improvement of the Steam Engine

Making Unusual Castings

By Walter J. May

The Mechanical Design of Ball Bearings and Roller Bearings

By W. S. Rogers

Gypsum (Plaster of Paris) and its Utilization.—I

A Future for the Ice-Manufacturing Industry

By W. E. Parsons

The Ethics of Trade Secrets

By Frederick P. Fish

What a Kilowatt-Hour of Electricity will Do

The Motor Torpedo Boat—A New Type

The Flights of Zeppelin's Airship on October 9 and 10, 1906

By Hergesell and Von Kehler

Poulsen's Telephonic Message Recorder

Gasoline, Kerosene, or Alcohol for Marine Explosive Engines

By A. E. Potter

Electric Sleep or Anæsthesia

By G. H. Niewenglowski

The Theory and Action of a 100-Mile Wireless Telegraph Set.—V

By A. Frederick Collins

Mortise and Tenon Joints

Rope Drives—Various Methods of Arranging Ropes on the Sheaves

By R. Hoyt

Eighteen Hundred Year Old Bacteria

Weight of Man on the Planets

Science Notes

Electrical Notes

Engineering Notes


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    February 23, 1907

    Science for the Modern World