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Direct Current vs. Induction Motor for Electric Traction

A Problem for the Air-Ship Builder

Colombia and the Panama Canal

Balloon Measurements of Mammoth Cave's Height

By Horace C. Hovey

The Trap-Lantern as an Insect Exterminator

By Harold Bolce

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

Machine for Grooming and Shampooing Horses

Cable Grip or Clutch Device

Improved Valve Mechanism


  • Ask the Brains

    Notes and Queries - August 29, 1903

  • Departments

    Correspondence - August 29, 1903

  • Business and Personal Wants

  • Recently Patented Inventions - August 29, 1903

  • Index of Inventions - August 29, 1903

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Dwindling Supply. Increasing Demand.

Dwindling Supply. Increasing Demand.

Solving the Water Crisis