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For Propeller Designers to Study

Photography In Crime Detection

Valuable Contributions, Need Seen for Uniformity of Photographic Records, Automatic Cameras for Picturing Criminals in the Act

By J. Edgar Hoover

A Bridge That Floats

Four-Lane Highway on Monster Pontoons, Over a Mile Long, Tied By Cables to Great Anchors in Bottom Mud, Safe, Vibrationless, Permanent

By Charles F. A. Mann

Air, Water, Coal = Hosiery

Fiber From Abundant Raw Materials, Fiber is Only One of a Large Family of Chemical Products Known as Nylon, Research That Led to Them

By H. T. Rutledge

Stopping Time

That is What "Whirling Watcher" Does, Newest Stroboscope is Light Weight, Portable, Allows "Stills" and Movies of Extremely Fast Movement

By Robert Littell

Winners in the Fourth Annual Scientific American Photography Contest

Algol's Eclipses

By Henry Norris Russell

Seven Million Maps

By Andrew R. Boone

Molds By Electro-Forming

Engineering In Dentistry

Dentists' Main Problems are to Get Strength Plus Resiliency, Add to This: Art, Precious Metal Alloys and New Porcelains Meet Needs of Dentists

By A. W. Jessup

Spare Parts

By G. H. Estabrooks


  • 50 Years Ago, February 1940

  • From the Editor

    Our Point of View, February 1940

  • Recommended

    Our Book Corner, February 1940

  • Departments

    Personalities in Science, February 1940

  • Neon Lamps Simplify Slip-Speed Checks, Weighting "Top-Heavy" Destroyers and more

  • Camera Angles, February 1940

  • Telescoptics, February 1940

  • Current Bulletin Briefs, February 1940

  • Legal High-Lights, February 1940

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