Scientific American Magazine Vol 121 Issue 24

Scientific American Magazine

Volume 121, Issue 24

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Features

First Underground Mining Mill in America

W. F. Wilcox

Around the World in Three Days?, The Uses Of The Navy and more

Again the Helicopter?

Experiments by Prominent Inventors Who Hope to Realize This Long-Standing Dream

Robert G. Skerrett

Post-Bellum Britain and the Inventor

Some Facts and Figures Regarding the Present British Patent Activities

George Craydon Marks

The Romance of Invention--V

Some Notes on the Lifework and Character of a Great Chemist

C. H. Claudy

With Typewriter and Offset Press

How the Scientific American was Manufactured in the Absence of Compositors and Pressmen

Signposts of the Sea

The United States Lighthouse Service

Bombardments from the Skies

The Recent Lake Michigan Meteorite, and Others of the Same Breed

Why Horses are Shod

Departments

Inventions New and Interesting - December 13, 1919

Recently Patented Inventions - December 13, 1919