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Features

Our Light-Plane Contest

Complete Details of the Scientific American 500 Dollar Prize for a Light Airplane Design

Solar Research for Amateurs--I

By Means of the Newly Developed Spectrohelioscope, Vivid Phenomena on the Sun May Now Be Observed in Motion by the Amateur Scientist

By George Ellery Hale

From the Scrap-book of Science, April 1929

A Mountainous Earthen Dam

Gigantic Earth-fill Dam In South Carolina, One of the Largest In the World, Will Be a Part of Huge Hydro-electric Project

Exploring the Biblical Beth-shan

For Thousands of Years, Invading Armies Stormed This Little Hill at the Crossroads of Palestine

By Cornelia H. Dam

Boston's New "Madison Square Garden"

How a Railway Station and an Auditorium Were Combined to Double the Use of Land

Quantitative Analysis of the Sun

The Ordinary Identification of the Chemical Elements on the Sun by Means of the Spectroscope Has Long Been Possible. The Newest Development Is Quantitative Analysis of These Same Elements

By Henry Norris Russell

Animal Allies of the Physician

How Vaccines, Snake Bite Serums, and Antitoxins Widely Used by Doctors are Prepared in a Modern Serum Laboratory

By Walter E. Burton

How People Differ Mentally

A Large Part of the Commonest Beliefs About Our Individual Powers and Limitations Are Not True

By Donald A. Laird

New Uses for Coal and Wood

Scientists, Seeking New Industrial Uses for Wasted Raw Materials, Produce Gasoline from Coal and Seek to Make Food from Wood Pulp

By Friedrich Bergius

The Month in Medical Science, April 1929

A Review and Commentary on Progress in the Medical and Surgical Fields

By Morris Fishbein

Why Do Insects Migrate?

More Controversy Than Knowledge Surrounds Their Mysterious Flights From North to South and Return

By S. F. Aaron

Safety for Those Who Go Down to the Sea in Ships

Paper Milk Bottles

An Improvement in Milk Distribution Which May Revolutionize a Vast Industry

Making the Farm Pay

A Practical Farmer Gives, From His Experience, Some Rules For Running a Farm Scientifically

By Frank M. Byers

Ultra-Violet Transmitting Glass--Has it Made Good?

Observations on the Physics and Physiology of Special Window Glass for Transmitting Indoors Part of the Vital Ultra-Violet Rays of the Sun, Based on the Opinions of Foremost Scientific Authorities

By Albert G. Ingalls

Electric Wife Saver, Stool-Ladder and more

Ball Cleaner, Arm Support and more

Departments

  • A Factory in the Wilderness

  • Departments

    Our Point of View, April 1929

  • Filling Station for Pocket Lighters, Houston's Arc-Welded Hangars and more

  • Planes on the Instalment Plan, Curtiss-Caproni and more

  • Poison Gas Worse Than a White Elephant, Synthetic Tannin Needed and more

  • Current Bulletin Briefs, April 1929

  • The Back Yard Astronomer, April 1929

  • The Heavens in April 1929

  • "Plymouth" is "Merely Geographical", Oil Company Wins "Parco" Decision and more

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April 1929