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Features

The Limit of Rapid Transit

Purity of Catskill Water Supply

The New British and German “Dreadnoughts”

The New Fourteen-Inch Army and Navy Guns

Acceleration of Long-Distance Express Service

The Other Half of the Cullinan

Engineering

Science

Electricity

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

Another Evil of Deforestation

Why Watch Springs Break

Railway Motor Cars

How Lemon Oil Is Made

By Frank N. Bauskett

Artillery for Airship Attack

Wireless Communication with Balloons

The Wellcome Tropical Research Laboratories

An Improved Steam Trap

Patent Department

Combined Timer and Distributer for Internal-Combustion Engines

A New Grain Bin Construction

Oddities in Invention

Departments

  • Departments

    Correspondence

  • Patents

  • Index of Inventions

  • Notes and Queries

  • Recently Patented Inventions

  • New Books, Etc.

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November 20, 1909

Confronting Common Wisdom