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Features

Drydocks for our Biggest Battleships

The Railways of the World

The Electric Locomotive of the Future

The Directive Sense of Bees

Electricity

Science

Engineering

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

Improved Head for Stringed Musical Instruments

Patent Department - July 10, 1909

Padlock with Incased Bolt

Metal Rail Base and Cross Tie for Railway Tracks

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    Index of Inventions - July 10, 1909

  • New Books, Etc. - July 10, 1909

  • Patents - July 10, 1909

  • Recently Patented Inventions - July 10, 1909

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July 10, 1909