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    Navy to Build “Octopus” Type of Submarine

    Electric Power Plants are Responsible

    Contract Awarded for Two Dreadnoughts

    Board of Underwriters on Cement Construction

    The Steel Rail Problem

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

    The Grand Prix International Automobile Race

    Sand Painting

    A Traction Wheel with Sinusoidal Tread

    The Riddle of Mars

    How Linoleums and Oilcloths are Made

    Some Interesting Tricks

    Captive Balloons in the German Army and Navy

    By Alfred Gradenwitz

    The Plug Puzzle

    Apparatus for Sustaining and Directing Balloons

    An Improved Button Latch

    Railway Track Construction

    Patent Department

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      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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    July 13, 1907