Natation

Features: Behind the scenes of news gathering - a co-operative, non-profit organization aids in disseminating accurately the news of the world (the Associated Press); Editorials - cause or effect of war? - fundamentals of education - "Rolling down to Rio" by airplane - drug control; More hard luck for the ether - a funal blow is dealt to the ether theory by experiments performed with a highly refined interferometer; Tungsten bows to the plating bath - this important metal can now be deposited electrolytically; The sun an atom builder - a new theory - an attempt to explain where the sun gets the energy which it radiates; Wings over three Americas - safety and comfort for passengers are the aims of international airways; Science lends a hand to the Red Cross; New paints from synthetic resins; Are swimming pools a health menace?; Some important exhibitions in the Boston Museum of Fine Arts; A solar observatory for the amateur - how to build simple equipment for solare research work; Cotton stalks - a new source of rayon; Celluloid taxidermy; Taming Silicosis; Combating magnetism in watches - Elinvar makes possible non-magnetic watch parts; When a sunbeam splits - an elementary principle of physics and an unusual analogy; The private car, yacht of the rails - the utmost in luxury that can be built within the limitiations of a railroad car. Two creases to front cover. Average wear. Unmarked. Book