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Features

Among Our Contributors, April 1930

Looking Ahead With The Editor, April 1930

May—Aviation Number

Manhattan's Mightiest "Minaret"

Many Unique Features and Engineering Problems Involved in Building the World's Tallest Structure

By F. D. McHugh

Can the World Banish Malaria?

A Physician's Practical Plan to Rid the World of the Mosquito-Borne Disease; a Plan Which Nearly All Can Test

By Theo. Krysto

The Two April Eclipses

Astronomers Will Make Full Preparation, Even Though the Coming Solar Eclipse Will Last Only Two Seconds

By Henry Norris Russell

Land Reclamation by Silting

Natural Humus Is Pumped, in Suspension, From Lake Bed Onto Gravelly Soil, Resulting in Extraordinary Fertilization

By Charles F. A. Mann

What Mummies Reveal

X-ray Studies of Peruvian Mummies Show Us the Injuries and Diseases From Which the Ancient Civilized Indians Suffered

By Roy L. Moodie

New Airplane View of Mount Wilson Observatory

A New Departure in Bridge Building

A Bridge of Unusual Design, Built by Unusual Methods, Is Nearing Completion Over the Elorn at Brest, France

By Herbert E. Steinberg

Movies Take on Color

By A. P. Peck

Policemen Are Made, Not Born

In the Highly Organized New York Police College Every Branch of Law Enforcement Is Dealt With in Detail

By Albert A. Hopkins

'Round a Round House

When Its Hard Day's Work Is Finished, the "Iron Horse" Retires for a Bath and Complete Inspection

By Francis X. Milholland

Take Your Camera Into the Air

Whether on Your First Flight or on a Long Air Journey, You Can Make Snapshots With an Ordinary Camera

By Robert E. Goode

Mining Coal With Mammoth Shovels

Open-Pit Mining Operations at Colstrip, Montana, Using New Operating Equipment of Unsurpassed Size and Efficiency

By Henry W. Hough

Unbreakable Movie Film

Steel-Sheathed Film Reduces Replacement Costs; Has Great Educational Value

Substituting for Sunlight

Has a New Era of Artificial Lighting Arrived? Illumination That Approximates Sunlight Is Foreshadowed

By M. Luckiesh

A Friendly Museum

Doing Away With the Disease Called "Museum Fatigue" by Skillful Planning and Lighting

Some Famous Centenarians

There Is No Recipe for Longevity, Which Is Mainly Hereditary. However, a Milk Diet Seems to Favor Long Life

By James A. Tobey

The Amateur Astronomer, April 1930

Departments

  • Cuba Builds a Model Highway

  • Gas Industry By-Product Aids Agriculture, Gas and Holder of Blimp Both Chemical Products and more

  • Departments

    Back of Frontispiece, April 1930

  • America's Foremost Physical Laboratory

  • Our Point of View, April 1930

  • Sinking a "Mine" Under New York City, "Spider Threads" of Glass and more

  • The Junkers Diesel, An Interesting Ski and more

  • Current Bulletin Briefs, April 1930

  • Carbon Monoxide Poisoning, Dislocations of the Neck and more

  • The Heavens in April 1930

  • Concrete Without Sand or Stone, Minute Impurity Explains Riddle of Photographic Film

  • Trademarks in Latin-America, Temperature Indicating Device Patent Sustained and more

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April 1930

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