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Electrifying the St. Clair Tunnel

The Electric Fusion of Glass

Superheat and Boiler Pressures

Speed and Safety in Railroad Travel

Foreshore Protection with Chain-Cable Groynes

Some Recent Discoveries in Oceanography

Mercury Arc Rectifier for Charging Storage Batteries

By A. Frederick Collins

The Tunnel Under the Seine River

By L. Ramakers

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 Curious Arched Tree

The “Auto-Carte”

A Novelty in Watch Dials

A Simple Dynamometer for School Gymnasium Testing

By Thomas R. Baker

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.


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February 17, 1906

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