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Features

Close of the Fourth Dimension Contest

The Scientific American Flying Machine Trophy for 1909

Rainmaking by Dynamite

The Highway and the Automobile

Science - March 27, 1909

Electricity - March 27, 1909

Aeronautics

The Mercury Telescope

By R. W. Wood

Superiority of Lock to Sea-Level Canal

Governmental Income and Outgo

The Navy's Dummy Drill Gun

By Walter L. Beasley

The Ice of the Arctic Waters

By Day Allen Willey

Tobogganing at Caux, Switzerland

By Deshler Welch

Apparatus for Treating Rubber

Patent Department - March 27, 1909

Valve for Flush Tanks

Adjustable Head for Piano Hammers

Engine Aliner

Improved Oar Lock

Kitchen Sink Cover

Pneumatic Milk Can

The German Crown Prince as an Inventor

Oddities in Inventions

Reciprocity in Patent Laws

Departments

  • Departments

    Correspondence - March 27, 1909

  • Notes and Queries - March 27, 1909

  • Recently Patented Inventions - March 27, 1909

  • New Books, Etc. - March 27, 1909

  • Index of Inventions - March 27, 1909

  • Patents - March 27, 1909

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