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The Ninth Annual Automobile Show in Madison Square Garden

The Gatun Dam Misrepresentations

The Labor Involved in Liquefying Helium




The British Army Aeroplane

Aeronautical Notes

Taximeter Frauds

By Roger B. Whitman

Clay Products of the United States

Automatic Block Signals

The Meat Industry of America.--II

Some Breads of Other Lands

By L. Lodian

Device for Testing Eggs

Milk-Bottle Holder

Vehicle Wheel Sled Runner

Finger-Developing Device

Flowing Oil Wells by Compressed Air


  • Departments

    Correspondence - January 30, 1909

  • The Heavens in February

  • Index of Inventions - January 30, 1909

  • Patents - January 30, 1909

  • Recently Patented Inventions - January 30, 1909

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