Volume 94, Issue 7
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Features
Speed and Safety in Railroad Travel
Superheat and Boiler Pressures
Electrifying the St. Clair Tunnel
Foreshore Protection with Chain-Cable Groynes
Some Recent Discoveries in Oceanography
Mercury Arc Rectifier for Charging Storage Batteries
The Tunnel Under the Seine River
The Size of Molecules
Making Valentines by the Million
The Total Solar Eclipse of 1905
The Human Body as a Wireless Telegraph Transmitter and Receiver
A Novelty in Watch Dials
The “Auto-Carte”
A Simple Dynamometer for School Gymnasium Testing
A Curious Arched Tree
An Improved Rail Joint
Wheel-Blocking Safety Device for Automobiles
Business and Personal Wants
READ THIS COLUMN CAREFULLY.—You will find inquiries for certain classes of articles numbered I in consecutive order. If you manufacture these goods I write us at once and we will send you the name and ! address of the party desiring the information. In every case it is necessary to give toe number of the inquiry. MUNN & CO.