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Wire-Wound Versus Steel Guns

Magnitude of Work on New State Barge Canal

City Terminals Without Traffic Connection

Burglar-Proof Glass




Some Experiments with an Orange

By Gustave Michaud

Some New Warships and Their Equipment

By Percival A. Hislam

Opening of the Down-Town Hudson Tunnels

The Third Honorable Mention Essay in the Fourth Dimension Competition

By Charles Henry Smith

The Scientific Work of the Late Prof. Simon Newcomb

The Disinfection of School Books

By Jacques Boyer

An American Farmobile

By Frank C. Perkins

The Flight of the Curtiss Aeroplane for the Scientific American Trophy

Automatic Drain for Compressors

Portable Winch

Patent Department - July 24, 1909

Panning Without Water

By Roland Ashford Phillips

Apparatus for Purifying Water by the Injection of Ozone

Paper Hanger's Trimmer

Lock for Electric Meters

Expanding Brush for Cleansing Bottles


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    Index of Inventions - July 24, 1909

  • New Books, Etc. - July 24, 1909

  • Recently Patented Inventions - July 24, 1909

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July 24, 1909