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Scientific American Magazine Vol 90 Issue 7

Scientific American Magazine

Volume 90, Issue 7

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Features

The Eiffel Tower

Precautions against Poisoning the Queen Bee

Value of Correct Propeller Design

Our System of Naval Comparison

The Hydroscope and Its Success

Progress in the Study of Radium and Radioactivity

The Fuel Supply of the Japanese Navy

The Current Supplement

A Practical Primary Battery

Safety Locomotive for Explosives Factory

Boiler Scale Detection

George J. Jones

The Japanese Navy

Results of the Florida Automobile Race Meet

A Great Engineering Feat

G. P. Blackiston

The Blue Gnu

Natural Monuments

Charles F. Holder

Business and Personal Wants

Departments

Legal Notes - February 13, 1904

Recently Patented Inventions - February 13, 1904

Notes and Queries - February 13, 1904

Index of Inventions - February 13, 1904

New Books, Etc. - February 13, 1904

Patents - February 13, 1904