Volume 122, Issue 24
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Features
Sounding with Sound
How the M-V Type of Hydrophone Developed for U-Boat Detection Now Serves the Peaceful Mariner
Making the Milkman Fear the Pump
Machinery for the Sugar-Beet Field, Mowing with the Tractor
Succeeding in Radio Engineering
One of the Newest of Professions, and One Well Worth the Attention of the Man With the Pioneering Instinct
The Scientific Basis of Carelessness
An Unrecognized Danger of Allowing Habit to Superintend Our Acts
Checking Up Einstein
The Proposed Repetition of the Michelson-Morley Experiment in Search of Evidence of Ether Drift
What About Our Wine Grapes?
A Few Reasons Why Prohibition Is Not Going to Bankrupt the California Growers
Breaking the World's Motorcycle Records, Lantern Slides by the Yard and more
Directing the Detourist
Business and Government
What the Department of Commerce is doing for America and What it Would Like to Do