The SciencesGlycerine from Petroleum, Electrostatic Iron Ore Separator, and moreBy F. D. McHugh, Alexander Klemin on May 1, 1940AdvertisementABOUT THE AUTHOR(S)Recent Articles by F. D. McHughCoal and Kilowatts, Carboloy Extrusion Process, and moreIndian Arrow Poison for Arthritis, Mental Disease, Enamels for Plastics, and more"Damp Cold" Better than Dry Cold, Engineer Discovers "Lightning" Radiation, and moreRecent Articles by Alexander KleminInstrumentation, Measurement, and ControlMust Flying be a "Racket"?Ideas in the Air