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Delicate Blades in a Liner's Power Plant

Earthquakes Need Not Kill

A Small Percentage Added to Building Costs for Adequate Bracing is Changing Earthquakes from a Dreaded Horror to an Interesting Phenomenon

By David O. Woodbury

Tinted Lenses

Sun Glasses Should Give Adequate Protection Yet Maximum Visibility, Objective is to Eliminate Rays Which Do Not Contribute to Seeing

In the Transatlantic Service

McDonald Observatory

The Large New Observatory in Western Texas Was Made Possible by an Amateur, An Admirable Site, An Efficient Housing and a High-grade Telescope

By Henry Norris Russell

Under the Nieuwe Maas

Unique Tunnel at Rotterdam, For Vehicles, Pedestrians, Cyclists, Rectangular, Sections Built on Land, Then Floated Out and Sunk in Place

By R. G. Skerrett

Flint Flaking

The Amateur Workman, as He Practices, Can Progress in Days through the Same Stages of Skill for which his Ancestors Required More Than 100,000 Years of Gradual Invention

By C. Stuart Johnston

More Oil From Crooked Wells

Controlled Directional Drilling . . . Significant Advance . . . Adds to Available Oil . . . Offshore Pools Tapped From Land Rigs . . . Other Uses

By Upton Close

We Build More Ships

The American Merchant Marine Begins Extensive, Orderly Expansion, Important for Our Economic Self-Sufficiency and National Security

By H. Gerrish Smith

Prehistoric Amfoils

Aboriginal Boomerangs Were Based on Principles Only Recently Rediscovered Analogous to the Helicopter, For Sport, Game, Protection

By Arthur E. Oxley

Departments

  • 50 Years Ago, August 1939

  • From the Editor

    Our Point of View, August 1939

  • Recommended

    Our Book Corner, August 1939

  • Departments

    Personalities in Science, August 1939

  • Unique Hinged Swing Spans on Bridge, Blight Resistant Chestnut, and more

  • Camera Angles, August 1939

  • What's New in Photographic Equipment, August 1939

  • Camera Angles Round Table, August 1939

  • Telescoptics, August 1939

  • Current Bulletin Briefs, August 1939

  • Legal High-Lights, August 1939

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August 1939

See the World from a Different Perspective

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