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Features

Food Selection—I

For Rational and Economical Living

By C. F. Langworthy

Long-Heads, Square-Heads, and Short-Heads

Removing Rust from Nickel

High-Explosive Shells

Ammunition Used in Modern Rapid Fire Guns

Turbine Blading

Photo-Chemistry

Research in Relation to the Reactions Caused by Light

By Harry A. Curtis

Moving a Lighthouse

Some Noted Zoological Parks

The National Zoological Park at Washington

By R. W. Shufeldt

Light and Illumination—II

A Survey of the History, Principles and Practice of Lighting Concluded from Scientific American Supplement No. 2099, Page 194, March 25, 1916

By Charles P. Steinmetz

Jupiter—the Solar King

By George A. Russ

Finding your Way at Night without a Compass

An Accomplishment Necessary for the Soldier, Explorer or Traveler

By Lieut-Colonel W. A. Tilney

Jupiter—The Solar King

By George A. Russ

Flame Standards in Photometery

Conditions to Be Met and Facts Relating to Lamps Used

Proctor's Formula for Tanning Hides

Sources and Collection of Rubber

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April 01, 1916

Think Outside the Gift Box