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Double-Door Cars for Subway Congestion

Urgent Need for the Catskill Water Supply

Heavy Traffic through the Newly-Opened Hudson Tunnel

The Alleged Patent Office Frauds

Sand Building-Bricks

Experiments with Recent French Aeroplanes

Progress of the Catskill Water Supply

II.--The British Navy of To-Day

A Simple Wireless Telegraph Detector

By Frank J. Kenney

Patent Department - March 7, 1908

Stamp-Affixing Machine

An Improved Washing Machine

Improved Plane Provided with Adjustable Guides


  • Departments

    The Heavens in March

  • Correspondence - March 7, 1908

  • Index of Inventions - March 7, 1908

  • Patents - March 7, 1908

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