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Steel Cavalry of Modern War

Machines for War

Organization and Operation of Mechanized Forces of Our Army

By J. E. McInerney

Tanks, Larger Cruisers

United States Deficient in Combat Vehicles; New Type, Heavily Armed and Armored, Suggested

Achievements in Textiles

Commonplace Fabrics with Superior Chaacteristics Given by Special Treatments

By Philip H. Smith

Metal from the Sea

Plant Will Extract Light-Weight Industrial Metal, Magnesium, From Solution

Bond, Porcelain-Like, and more

Maestro of the Atom

Lawrence Had an Inspiration, So Science Now Has the Cyclotron for Smashing Atoms

By Loring A. Schuler

More About the Cyclotron

For Readers Who Wish to Look Further into its Technical Details

Electron Volts, Raman Effect

So Often Seen in Print—So Seldom Interpreted; Theoretical Discovery Now Has Practical Value

An Ideal Experiment

Taking the Moon's Temperature During an Eclipse Reveals a Phenomenally Big Drop

By Henry Norris Russell

The Temple of the Effigy

Evidences Unearthed in Ohio Afford Clear Proof of a Grisly Mound-Builder Rite

By Willis H. Magratha

Mound Builders, Exaggerated

No Longer are They A Complete Mystery

What Makes an Aviator?

Intelligence, Adaptability, Physique, Mental and Physical Health Are Factors

By Joseph G. Levine

50,000 Airplanes, Camera Guns, and more

How We Can Build Planes at a Rate of 20,000 a Year; Two Types Permit Economical Aerial Gunnery Practice; Pick Up Aircraft After Crashes or Forced Landings

Bleeders, Theelin, and more

Is your Pet Dentifrice Safe?

Most Dentifrices Are Good but Many of the Claims Made Are Not Justified

By Albert G. Ingalls

Why Universal Fingerprinting?

Desirable Features of System Far Outweigh Erroneously Imagined Criminal Aspects

By Frederick Kuhne

Healthier Plants, Heroic Casting, and more

Fifth Annual Scientific American Amateur Photography Contest


  • 50 Years Ago, August 1940

  • From the Editor

    Our Point of View, August 1940

  • Browsing with the Editor, August 1940

  • Recommended

    Our Book Corner, August 1940

  • Departments

    Industrial Trends, August 1940

  • Camera Angles, August 1940

  • Your Firearms and Fishing Tackle, August 1940

  • Telescoptics, August 1940

  • Legal High-Lights, August 1940

  • Curent Bulletin Briefs, August 1940

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