The SciencesOne Million Inches of Fine Ruling on Glass, Leaping Lena and moreBy F. D. McHugh on September 1, 1936AdvertisementABOUT 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 moreGlycerine from Petroleum, Electrostatic Iron Ore Separator, and more