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Rotary Converter Sub-Stations of the Long Island Railroad

Contemporary Electrical Science


Gas Engines for Ship Propulsion

Canal Barge

By J. E. Thoenyceoft

Canals: Ancient and Modern.—II

The Metals in Human Progress

By Nelson P. Hulst

Foreign Commerce of United States

The Mud-Skipper or Jumping Fish

By Randolph I. Geare

Gypsum-A much Misunderstood Material

By Robert Grimshaw

Devices for Determining the Energy Losses in Iron Sheets

By Alfred Gradenwitz

Control of the Direction of Electric Waves

By William Marconi

White Cements

Engineering Notes

Primers and Fuzes for Cannon.—II

By Ormond M. Lissak

Preliminary Report of the State Earthquake Investigation Commission

Trade Notes and Formulæ


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