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Features

The Human Potential in Industry

National Efficiency, Now Expressed in New Terms

By Otto P. Geier

Free Gas Mantles in England

Fustic

An Important Dye Wood

By C. D. Mell

Chemical Differentiation of the Central Nervous System in Invertebrates

By A. R. Moore

Marine Engineering from 1911 to 1917

The Mystery of the Transparent Rat

Safety in Industry

First Aid and Accident Prevention in a Great Manufacturing Plant

Drum-Fire

Prof. Malladra's Recent Researches at Vesuvius

Between the Tigris and the Indus

A Region of Great Future Commercial Importance

By Thomas H. Holdich

Destruction of Field Mice

The Efficiency of the Employe

Determination of the Density of Solids

Building a Moving-Picture Camera

A Serviceable Home-Made Machine for $6.50

By E. H. Williamson

Change of Conductivity of Minerals by Illumination

Under-Sea Instinct of the Sea Lion

Practical Wartime Shell Making

Color and Color Photography

A Review of Problems Involved, and Methods of Working

By C. D. Hodgman

Action of Lead as a Stimulant for Plants

Shells and Hand Grenades of Cast Iron

Stepped Ignition of Gases

Departments

  • Altitude of Bird Flight

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December 22, 1917

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