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The Waste of Our Natural Resources

Fewer Broken Rails

A New Fire-Alarm System for New York



Belin's Improved Apparatus for the Electrical Transmission of Pictures

By Jacques Boyer

Is the Earth's Shape Changing

By J. F Springer

Impressions of American Inventors.--II

Experiments with Hydroplanes or Skimmers

By the English Correspondent of the Scientific American

Artificial Rubies

By Victor Barton

An Automobile Trolley-Repair Truck

By Alfred Gradenwitz

A Simple Medical Coil

By Frederick E. Ward

Handy Man's Workshop


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    Notes and Queries

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  • Index of Inventions

  • Recently Patented Inventions

  • Patents

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June 12, 1909