Title: Study of a static screen, jig, spiral, and a compound water cyclone in a placer gold recovery plant
Subjects: Gold ores, Ore-dressing, Ordnance, United States, Science and state, Electric apparatus and appliances, International cooperation, Science, Electric insulators and insulation, Proximity fuzes, Electrification, Telemeter, United States. Office of Scientific Research and Development, Bombardment, Aerial operations, World War, 1939-1945, United States. National Bureau of Standards, Metric system, Weights and measures, Armed Forces