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Air Control Solves Tube Problem

Green Dragon Of The Tropics

Banana Fungus, Picturesquely Named by Natives, Threatened Extinction of Industry, Menace Averted, Enormous Cost, Ingenuity Involved

By Charles Morrow Wilson

More Miles Per Gallon

Fuel of the Future, Car of Future Designed For It, Both Will Come Through Co-Operative Research, Future Presaged by Past Progress

By Graham Edgar

What Does the Soil Need?

Scientific Fertilizing Produces Remarkable Results, Possible When Soil Minerals, Soil Needs Are Known, Proper Tests Give Answer To Grower

By H. T. Rutledge

Stars That Have Chemistries

Certain Classes of Stars Have Atmospheres Like the Familiar Oxidizing and Reducing Atmospheres of the Chemical Laboratory

By Henry Norris Russell

Man's Earthly Future

How Long Will Our Earth Survive, and How Long Will the Species Called Man Endure on It? Man's Fate: Either Oblivion or Improvement

By Kirtley F. Mather

When Water Shortage Threatens

Lessons Learned by New York City, Prolonged Wet Spells Give False Sense of Security, How Wastage May be Decreased to Conserve Supply

By Edward Nuebling

Soundless Sound Waves

Supersonic Waves in Science and Industry, For Smoke Precipitation, Emulsification of Liquids, in Fishing and in War, Sounds that Burn

By Walter L. Finlay

Railroads in the Cellar

Capitalization of Model Railroads Now Runs Into Many Millions, Serious Avocation, Men Form Exclusive Clubs, Run Trains Like Railroaders

By R. T. Griebling

Food by Vein

Hospitals are Beginning to Use the New Method of Supplying Food to Those Who Cannot Eat. The Expectations are Auspicious

By Barclay Moon Newman

Departments

  • 50 Years Ago, April 1940

  • From the Editor

    Our Point of View, April 1940

  • Recommended

    Our Book Corner, April 1940

  • Departments

    Personalities in Industry, April 1940

  • "Damp Cold" Better than Dry Cold, Engineer Discovers "Lightning" Radiation, and more

  • Camera Angles, April 1940

  • Telescoptics, April 1940

  • Current Bulletin Briefs, April 1940

  • Legal High-Lights, April 1940

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April 1940

See the World from a Different Perspective

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