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Direct Current vs. Induction Motor for Electric Traction

Colombia and the Panama Canal

A Problem for the Air-Ship Builder

The Trap-Lantern as an Insect Exterminator

By Harold Bolce

Balloon Measurements of Mammoth Cave's Height

By Horace C. Hovey

Concrete House Building

Automatic Paper-Feeders for Printing Machinery

Development of the 90-Foot Racing Yacht

Improved Breech Mechanism for Heavy Guns

Light Motor for a St. Louis Contest Airship

Improved Valve Mechanism

Cable Grip or Clutch Device

Machine for Grooming and Shampooing Horses


  • Ask the Brains

    Notes and Queries - August 29, 1903

  • Departments

    Correspondence - August 29, 1903

  • Index of Inventions - August 29, 1903

  • Recently Patented Inventions - August 29, 1903

  • Business and Personal Wants

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August 29, 1903

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