Arenes

1931 — 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. Book