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Features

Railway Safety and Railway Economics, The Invisible Man Behind the Gun and more

The Balboa Docks

How the Solid Masonry Columns for Supporting the Great Wharves at the Pacific Ocean Entrance to the Panama Canal were Rapidly and Economically Constructed, Carrying the Foundations Down to Bed Rock...

"Notable Salvage Work Upon the Empress of Ireland, The Highest and Lowest Temperatures in the Atmosphere and more"

By Robert G. Skerrett

A Formula for Calculating the Tactical Value of Fighting Ships

By A. Given

War Experiences of an Air Scout-III*

A Battle in the Clouds
[Cover image of January 9, 1915, issue illustrates this article]

By Frederick C. Hild

Measuring Human Intelligence

A Progressive Series of Standardized Tests Used by the Public Health Service to Protect Our Racial Stock

By Howard A. Knox

Temperature in Plants

By S. Leonard Bastin

Archimedes and his Lever, Dr. Hall, the Aluminium Pioneer

By C. O. Sandstrom

New Railway Signal

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    Recently Patented Inventions - January 9, 1915

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