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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

Science and research. Studies of non-coking coals. Research workers at...

Picryl description: Public domain image of people, meeting, eating, drinking, food, beverage, 1930s, free to use, no copyright restrictions.

Petaluma, Sonoma County, California. Weighing eggs to determine their suitability for the hatchery

Petaluma, Sonoma County, California. Weighing eggs to determine their ...

Picryl description: Public domain image of food, dinner, grocery store, eating, 1930s, mid-20th-century United States, free to use, no copyright restrictions.