National Geographic : 1939 Nov
© National Geographic Society AS TEA MELTS SUGAR, NITRIC ACID DISSOLVES SILVER Five tons of silver are used each week at Eastman Kodak's factory in Rochester, New York. Left in the tank, when the bars are fully dissolved, is silver nitrate in solution; it goes into making film and paper emulsions. Kodachromes byWillard R.Culver TESTING SPUNGLASS FOR USE INSHOE SOLES Today " Fiberglas " forms anoutstanding material inalmost every industry. Here this new product isbeing utilized asasole filler toprovide shoes with insulated, cushioned treads and tomake soles more flexible.