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The Worst Enemy of the Good Roads Movement

Erosion--The Last Problem for the Gunmaker

Stupendous Traffic of Greater New York

A New Airship

The “Virginia” Potato

By W. R. Gerard

Photograph of the "Pennsylvania."

Road Tarring in France

By the Paris Correspondent of the Scientific American

Hot-Water Supplies to Towns

By Thomas Parker

Modern Bell Casting

By Alfred Gradenwitz

Gila Monsters

By D. A. Willey

The Growth of Our Navy Since the War

Means for Automatically Balancing Rotating Masses

A Simple Canceling Machine

Support for Fire Hose

Implement for Plowing or Cultivating Around Trees

Business and Personal Wants

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    Correspondence

  • Recently Patented Inventions

  • Notes and Queries

  • Index of Inventions

  • Patents

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September 15, 1906

Complex Causes. Alternative Solutions.