Science and research. Studies of non-coking coals. Research workers at the Golden, Colorado field station of the U.S. Bureau of Mines at a fifty-pound coke oven, which is used to determine if an unknown coal has coking properties. Coal is tested at various temperature levels to determine its adaptability to coking. Left to right: Ralph Maugham, labor foreman; William Landers, assistant chemical engineer; V.F. Parry, supervising engineer. Mr. Landers is shown using an instrument which measures temperature by the color of the heated mass. The bureau is carrying on a project to determine the suitability of western coal for coke operations with the view to supplying war needs of the expanding iron and steel industry of the Western states. Sourced from the Library of Congress.