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Retrospect of the Year 1909


Electrical Heat Penetration

By Alfred Gradenwitz

Oxygen and Human Energy

By John B. Huber

An Automatic Apparatus for Projecting Pictures

By Jacques Boyer

The Current Supplement, A Correction

The Great St. Bernard Hospice

By Harold J. Shepstone

David Starr Jordan

By Marcus Benjamin

The Rignoux-Fournier System of Television

By Fernand Honore

Patent Department


  • Departments


  • The Heavens in January

  • Recently Patented Inventions - January 1, 1910

  • Index of Inventions - January 1, 1910

  • New Books, Etc. - January 1, 1910

  • Notes and Queries - January 1, 1910

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