Volume 112, Issue 7
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Features
Hydraulic Fill Dam for an Earthquake Region
Work on the Calaveras Reservoir of the San Francisco Water Supply
Using a Store Entrance for Night Displays
Elevator Show Windows That are Dressed in the Basement
Military Air Scouting by Motion Pictures, Steel Darts, and more
Germany has apparently used motion pictures to scout enemy positions.
Doing Without Europe--III
How the War Has Affected Our Mineral and Metal Industries and How We May Profit
The United States an Undefended Treasure Land - Part II
We Are Short of Arms and Ammunition for Regulars and Militia, and Have Absolutely None for Such Volunteers as Would Have to be Raised in the Event of Invasion
Heat from Our Lady of the Snow
Coal-Mining in the Arctic Circle