Volume 123, Issue 5
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Features
Our Future Oil Supply
A Hopeful View of the Possibilities of the Mexican Fields
How a Road Rests in its Bed, Soap from Lignite Tar Oils
Scrapping Good Machinery for Better Service
The Romance of Invention--XV
Frederic E. Ives, Wizard of Color and Light, and Father of the Half-Tone
Our Mechanical Eyes
Glass for Optical Purposes, and How It Is Made
Learning by Seeing
Keeping the Camera on an Even Keel, Telephoning in Cipher
The America's Cup Races
Notes on the Contests for 1920