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Features

Among Our Contributors, February 1930

By Alfred C. Lane

Looking Ahead With the Editor, February 1930

American Ships and American Prosperity*

A Discussion of the Weak Link in Our Transportation System and the Need of Public Support for a Greater Merchant Marine

By E. M. Herr

How Old Is the Earth?

How Geologists, Physicists, Geophysicists, and Other Scientists Are Pooling Their Knowledge for a Combined Attack on This Ever-fascinating Problem

By Alfred C. Lane

Rats

The Rat Is Such a Common, Familiar Animal That His Psychology Has Almost Been Overlooked. But Even a Rat Is Interesting

By Calvin P. Stone

The Radio and the Spectroscope, February 1930

By Henry Norris Russell

Quarrying Marble, the Token of Eternity

Ancient As the Everlasting Hills, Marble Furnishes a Lasting Material for Building Construction and Memorials

By A. E. Holden

Sea Safety Inventors Receive Their Reward

The Detroit River Is Spanned

At An Extremely Important Point, Economically, a Beautiful Bridge at Detroit Has Largest Span in the World

By F. D. McHugh

A Modern Inferno

What the Civilized World Owes to the Scientific Research of the Modern Chemist

By Martin Meyer

Army Flier Secures Record Photograph

Painting With Light in Barcelona

Spectacular Electrical Lighting Effects Enliven the Spanish International Exposition

The Winning Design in Our Light-Plane Contest

A Detailed Description of the Tandem Biplane With Steel Fuselage That Won the Scientific American Medal

The Last Stand of the Nevada Pueblos

In Southern Nevada Another "Lost City" of the Early American Indian Has Been Discovered, Throwing Light on Pre-Columbian History

By Irwin Hayden

Opera Comes Into its Own

Combining Offices With an Opera House May Solve Problems of Perennial Deficits

By Albert A. Hopkins

The Business Executive Takes to the Air

Survey Shows Many Firms Operate Company-Owned Planes

By Douglas W. Clephane

A Big Practical Problem for Science

What Will Be the Power Source of the Future, When the Coal Supply of the World Is Exhausted? Photochemistry Offers One Possibility

By F. M. Jaeger

The Amateur Astronomer, February 1930

Departments

  • Departments

    Back of Frontispiece, February 1930

  • Growth of the Highway

  • Our Point of View, February 1930

  • Exceptional Mastodon Bones Found, Holes in Submarines Patched Under Water and more

  • Junkers "G-38", Progress of the Year and more

  • Current Bulletin Briefs, February 1930

  • New Baking Powder Leaves No Traces in Bread, Removing Calcium Sulfate Deposits from Pipes and more

  • Carbon-Arc or Quartz Mercury-vapor Lights, The American Diet and more

  • The Heavens in February 1930

  • Ultra-violet Rays Said to Improve Flour, "All the Gold in the World" is Not So Much and more

  • "This Aviation Business"

  • "Trademark Specialists" Repudiated, Rejection of Claims Due to Delayed Application and more

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February 1930

Think Outside the Gift Box