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Comparison of Steam and Producer-Gas Marine Plants

Defense Against Dirigibles

To Keep the Peace

Station Announcers on Trains




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

Signaling to Mars with Mirrors

Slipping of Wheels on Curves

Some More Lunar Superstitions

Can-Filling Machine

Self-Cleaning Brush

Patent Department

Poultry-Picking Machine


  • 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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