Volume 109, Issue 25
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Features
Inspecting Track Scales for the United States Government
New Test Car and Equipment of the National Bureau of Standards
A Fort that Travels on Wheels
Schneider Mobile Batteries for Coast Defense
Flying for Altitude Records, An Object Lesson in Road Maintenance and more
Obituary, The Current Supplement
Studying Ripening Bananas with the Respiration Calorimeter
Atlantic Steamships--A Retrospect
Thirteen Years' Development of the Transatlantic Liner
How many Stars are there in the Milky Way?
A Great Astronomical Problem and how it is Attacked