Title Scientific American April 1931 Volume 144 Number 4
Size 4to - over 9¾" - 12" tall
Publisher New York Scientific American Publishing Company 1931
Seller ID 35507806
A particularly interesting issue with topics ranging from the 100 horsepower blower for the organ in the new Chicago Stadium to an English vending machine which dispenses individual lit cigarettes. Features: The eyes and ears of the railroad - the complicated signal system that spells safety for rail travel; Editorials - Arthur G. Halfpenny - An Awakening Due - Lopsided progress; International Affairs; Did a meteorite strike a car in Crawfordsville?; New light on old fools - ultr-violet irradiation to create vitamin D; Unique solutions of bridge construction problems - caissons sunk on artificial islands - divers employed; Vacuum tubes in industry - thermionic tubes, grid-glow relays, photo cells find wide use; A new use for radium - radiography possible without combersome apparatus; Radio goes man-hunting - radio alarm system reduces the criminal's chance of escape; New temperature measurements of the sun, moon, mars - sensitive thermo-couples reveal surface conditions; Chicago's "Madison Square Garden" - called "world's largest sports arena"; has unusual features; Butterfly farming - an intriguing business started by Iowa youth; When locomotives go to sea - special steamers built to accomodate monsters of the rails (excellent photos); A machine-age "milk maid" - the "rotolactor' milks 240 cows in one hour; Centrifugally spun concrete piles - new manufacturing process; mass production of preserved foods - a huge industry that grew from a market basket; Salt making in India - Primitive methods illustrated and described. Average wear. Unmarked. Crease to front cover. Advertisement inside front cover features photo of luxurious Cord front drive automobile manufactured by the Auburn Automotive Company.