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With in the Housing of a Giant Atom Smasher

Eyes that See Through Atoms

The Spectroscope, Long a Master Key in Science, is Proving to be of Major Practical Importance In a Wide Variety of Arts and Industries

By George Russell Harrison

Five Companies Present Safety

Superior Safety Glass, Four Times Safety Factor, Five Times Elasticity of Old Product

Bombing Raids Will Find London Prepared

River Models Outwit Nature

Miniatures of Rivers, Harbors, Dam Projects Solve Flood and Flow Problems. Considerable Design Ingenuity Involved in Model Making

By Paul W. Thompson

No More Blown Patterns

Top Wad in Shot-Gun Shell is the Villain That Causes Them, Elimination of Wad by a New Crimped Shell End, Unimpeded Shot Charge

Up in the Air for a Hobby

Half a Pound of Power, Avocation Makes Big Business, Inexpensive Midget Motors by Mass Production

By L. B. Pope

A Remarkable Triple Star

How the Spectroscope, Working on a Star Whose Secrets the Telescope Does not Reveal, Afords a Striking Abundance of Detailed Facts

By Henry Norris Russell

What Six Years Did

In the Design of Large X-ray Equipment, Progress Has been Extremely Great in the Past Few Years ... Hospital X-ray equals 90,000,000 Worth of Radium

Why the Earth's Magnetism?

The New Elsasser Theory, Radioactivity Heats Earth's Interior, Heat Sets up Eddies, Currents of Thermoelectricity Flow, Causing Magnetism

By C. W. Sheppard

The Saluki Everlasting

Carvings Found in Ancient Ruins in the Near East Show That a Breed of Dogs Now Fashionable Among Fanciers was a Favorite there 5000 Years Ago

By W. H. Noble


  • 50 Years Ago, September 1939

  • From the Editor

    Our Point of View, September 1939

  • Recommended

    Our Book Corner, September 1939

  • Departments

    Quartz-Like Glass, New X-Ray Units for Fighting Cancer, and more

  • Camera Angles, September 1939

  • Camera Angles Round Table, September 1939

  • Telescoptics, September 1939

  • Current Bulletin Briefs, September 1939

  • Legal High-Lights, September 1939

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