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Drydocks for our Biggest Battleships

The Directive Sense of Bees

The Electric Locomotive of the Future

The Railways of the World




The Guayule Rubber Industry

By J. E. Kirkwood

The Standard Electrical Cell--Its use and Its Practical Value

By Herbert T. Wade

A 5,000-Ton Testing Machine

The Fourth Dimension Simply Explained

The First Honorable Mention Essay in the Fourth Dimension Competition

Carving Statues by Means of Photography

By J. Hammond Smith

The First Flight Exhibition and Tournament of the Aeronautic Society

A Huge Planetarium

By George Sherwood Hodgins

Padlock with Incased Bolt

Patent Department - July 10, 1909

Improved Head for Stringed Musical Instruments

Metal Rail Base and Cross Tie for Railway Tracks


  • Departments

    New Books, Etc. - July 10, 1909

  • Patents - July 10, 1909

  • Index of Inventions - July 10, 1909

  • Recently Patented Inventions - July 10, 1909

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