Scientific American Magazine Vol 144 Issue 1

Scientific American Magazine

Volume 144, Issue 1

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Features

Ivory, the Pearl of the Forest

Ernst D. Moore

Testing the Astronomical Yardstick

Henry Norris Russell

A Stone Dam Greater than Cheops' Pyramid

P. M. Downing

Has Living Matter Been Produced in the Laboratory

Maynard Shipley

The Volcanic Birth of a New Island

Mining the Sky for Scientific Knowledge

W.J. Humphreys

Modern "Alchemy" in Iron and Steel

F.D. Mchugh

Preserving Newspaper Files

R.P. Walton

An Actor Turns Inventor

A Safety Oven Shelf Spelled Financial Success After a Lifetime on the Stage

Milton Wright

Practical X-Ray Crystal Analysis in Engineering'

V. E. Pullin

Pre-constructed Pipe-line Hauled out to Sea

Giant Tortoises

Nearing Extinction on the Galapagos Islands, They Are Being Propagated in the United States

Charles Haskins Townsend

From the Archeologist's Notebook

New Allenby Bridge Makes Petra Accessible

Landscaping with Fully Grown Trees

H. L. POPENOE

On the Track of the Mayas

Departments

Across the Editor's Desk, January 1931

Back of Frontispiece, January 1931

The Inhabited Wing Plane of the Germans

Our Point of View, January 1931

Nineteen-Story Arc Welded Building, Human Bites and Infection and more

Current Bulletin Briefs, January 1931

Turpentine, Rosin Consumption, Traffic Signal Patented and more