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The Koerting 200-Horse-Power Valveless Two-Cycle Petroleum Engine for Submarine Boats

The English Correspondent of Scientific American

Practical Results in the Preparation of Plastic Material

Testing Rubber Samples


Properties of the Series Transformer

By W. B. Gump

Electric Smelting of Canadian Iron Ores


By Eugene Haanel

A Novel Microphone

The Electrification of the West Jersey and Seashore Branch of the Pennsylvania Railroad

Linotype Metal

A Native Steel-Smelting Village in West Africa

By the English Correspondent of Scientific American

Platinum Plating and its Execution

Effect of Moisture on the Strength and Stiffness of Wood

Hot-Air Ballooning

An Electric Recording Pyrometer

Utilization of Waste Materials.—I

Wood Waste

By Theodor Koller

The Effect of Air Waves on Astronomical Observations

By G. Millochau

Engineering Notes


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