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During WWI, many of the aviation problems assigned by the National Advisory Committee for Aeronautics (NACA) to the Navy and War Departments were, since they lacked research facilities, turned over to the Bureau as it "became the scientific laboratory for the two military services." All of the altimeters, airspeed indicators, tachometers, and other aeronautical instruments that came to the Bureau for examination and testing were based on European prototypes. Many were still in an elementary stage and underwent considerable modification in the laboratories prior to their adoption as standard by the U.S. Army and Navy [From Measures for Progress, by Rexmond Cochrane, pp. 159-160, 181.] In the early 1900s, the Bureau's Heat and Thermometry section acquired thermometers from France and Germany as working standards. The Bureau was therefore prepared to certify almost any precision thermometer used in scientific work, most low-temperature engineering and industrial thermometers, and all ordinary commercial thermometers [From Measures for Progress, by Rexmond Cochrane, p. 78,  https://doi.org/10.6028/nbs.mp.275  ]

 
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