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Board of Underwriters on Cement Construction

Contract Awarded for Two Dreadnoughts

Navy to Build “Octopus” Type of Submarine

Electric Power Plants are Responsible

The Steel Rail Problem

Gasoline Motor Cars Adopted for Branch Line Service on the Union Pacific Railroad

The Grand Prix International Automobile Race

A Traction Wheel with Sinusoidal Tread

Sand Painting

The Riddle of Mars

How Linoleums and Oilcloths are Made

Captive Balloons in the German Army and Navy

By Alfred Gradenwitz

Some Interesting Tricks

Apparatus for Sustaining and Directing Balloons

Patent Department

Railway Track Construction

The Plug Puzzle

An Improved Button Latch


  • Departments

    Correspondence - July 13, 1907

  • Recently Patented Inventions - July 13, 1907

  • New Books, Etc. - July 13, 1907

  • Notes and Queries - July 13, 1907

  • Index of Inventions - July 13, 1907

  • Patents - July 13, 1907

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