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Comparison of Steam and Producer-Gas Marine Plants

To Keep the Peace

Station Announcers on Trains

Defense Against Dirigibles




The New Knippels Bridge at Copenhagen

By our English Correspondent

Fluid Compression of Steel Ingots

By J. F. S. Springer

The New United States Battleship "Mississippi"

The Manufacture of French Postage Stamps

By Jacques Boyer

Some More Lunar Superstitions

Slipping of Wheels on Curves

Signaling to Mars with Mirrors

Can-Filling Machine

Self-Cleaning Brush

Poultry-Picking Machine

Patent Department


  • Departments

    Correspondence - May 29, 1909

  • The Heavens in June

  • Index of Inventions - May 29, 1909

  • Patents - May 29, 1909

  • Recently Patented Inventions - May 29, 1909

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May 29, 1909

The Antidote to Anti-Intellectualism