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

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

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

Stopping Time

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

Winners in the Fourth Annual Scientific American Photography Contest

Algol's Eclipses

Seven Million Maps

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

Spare Parts