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Purity of Catskill Water Supply

Acceleration of Long-Distance Express Service

The Other Half of the Cullinan

The New Fourteen-Inch Army and Navy Guns

The New British and German “Dreadnoughts”

The Limit of Rapid Transit




Something New in Concrete Block Making

By M. H. Hunting

A “Dreadnought” of 1863

Power Indicator for Internal-Combustion Engines

The Solar and Lunar Eclipses of 1909

By Frederic R. Honey

Railway Motor Cars

Another Evil of Deforestation

Why Watch Springs Break

How Lemon Oil Is Made

By Frank N. Bauskett

Artillery for Airship Attack

Wireless Communication with Balloons

The Wellcome Tropical Research Laboratories

Oddities in Invention

Combined Timer and Distributer for Internal-Combustion Engines

An Improved Steam Trap

A New Grain Bin Construction

Patent Department


  • Departments


  • Index of Inventions

  • Recently Patented Inventions

  • Patents

  • Notes and Queries

  • New Books, Etc.

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November 20, 1909

20% Sitewide for President's Day