Scientific American Magazine Vol 147 Issue 3

Scientific American Magazine

Volume 147, Issue 3

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Features

Smoothing the Bore of a Hoover Dam Tunnel

Flying in the Beginning

General William Mitchell, Hugh D. Wise

The Peregrinations of a Freight Car

Francis X. Milholland

New Planetary Discoveries

Henry Norris Russell

The Muscular Power of Insects

S. F. Aaron

A Masterpiece of Museum-Craft

Radio in the Forest Service

New Transmitter-Receivers, One Weighing Only Ten Pounds, Are to be Thoroughly Tested This Year

A. Gael Simson

Solo Man--A New Fossil Skull

William F. F. Oppenoorth

New Notes on Ancient Man

Albert G. Ingalls

Tropical Fish as Pets

Food for a Floating Hotel

The Supplies for an Ocean Liner's Next Trip Are Ordered While 1000 Miles at Sea

Albert A. Hopkins

Whirling Molten Steel to Make Gun Castings

Steven L. Conner

Treasure Trove in Lowly 'Sweeps'

Building Safety into Automobile Glass

Byron C. Foy

Quartz Takes up Fire Fighting

Grace Lockhart

Departments

Across the Editor's Desk, September 1932

Back of Frontispiece, September 1932

Our Point of View, September 1932

Youthful Maturity, Colored Newspapers in Siam and more

Advertising as a Curb on Product Design Pirates, Patent Assignment Rights Defined and more

Books Selected by the Editors, September 1932