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Features

A New Fire-Alarm System for New York

Fewer Broken Rails

The Waste of Our Natural Resources

Science

Electricity

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

  • Recently Patented Inventions

  • Index of Inventions

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June 12, 1909

Beyond XX and XY

Biology. Identity. Equality.