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Dated Chimpanzees

Yale's Ape Colony, in Florida, is a Laboratory in Which Discoveries Directly Applicable to Man are Being Made on Man's Closest Relative, the Ape

By Barclay Moon Newman

A Faster Army Rifle

Garand Semi-Automatic Rifle Adopted by U. S. Army, Self-Loading, Fires Clip of Eight Cartridges, More Rapid Fire, Gun Held on Target


A Fascinating Little Experiment Reveals a Surprise and Later May Lead to Some Utilitarian Purpose

Up From the Ashes

New York World's Fair 1939 a Glittering Cinderella, Engineering Difficulties of Filling in and Building Upon Ash-Filled Swamp Muck

By John P. Hogan

Test Your Soil

Home Gardener or Commercial Grower May Test Soil With Simple Kits, Grow Better Plants

By Arthur Hawthorne Carhart

Powder Metallurgy

Tungsten Filaments Started It, Now Superior "Alloys" Made Without Melting, Components Retain Identity, Can Alloy Metals, Non-Metals

By Philip H. Smith

The Amateur's Seismograph

Instructions for Building and Operating in the Owner's Cellar an Instrument which Will Record Quakes from the Most Distant Parts of the Earth

By Austin E. Jones

From Logs to Plywood

"Unwinding" Trees, Stronger Lumber, Made Possible by Research, Co-operative Efforts

By A. P. Peck

Sodium Skies

Recent Research Indicates that a Large Part of the Illumination We Commonly Designate as Starlight Originates in the Earth's Upper Atmosphere

By Henry Norris Russell


  • 50 Years Ago, February 1939

  • From the Editor

    Our Point of View, February 1939

  • Recommended

    Books Selected By The Editors, February 1939

  • Departments

    Pattern of a Golfer—by Photography

  • American Archeologists in Ancient Athens

  • Largest Steam Hammer, X-Ray "Candid Camera" Snaps Human Chest, and more

  • Current Bulletin Briefs, February 1939

  • Camera Angles, February 1939

  • Camera Angles Round Table, February 1939

  • Telescoptics, February 1939

  • Legal High-Lights, February 1939

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