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accuracy Aeronautics Air Service alloys American ammonia analysis apparatus Association batteries Bureau of Aeronautics Bureau of Standards calibration carbon cent chemical Circular color color grading color temperature colorimetry commercial committee completed conference connection considerable construction cooperation Department determine developed devices division dry cells effect electrical electrolysis engineering equipment errors fire tests galvanometer gases gauge blocks gauges glass Government heat hydrometers important improved indicate industry instruments investigation Jour laboratory lamps large number magnetic manufacturers master scales materials ment metals meter Miscellaneous National obtained operation optical paper plates platinum practice precision prepared problems properties pyrometers radiation radio raffinose railroad request resistance Safety Code samples scientific Screw Thread Society specifications spectra steel submitted sucrose sugar technical temperature thermal thermocouples thermometers tion track scales tubes tungsten types United utility various weighing scales weights and measures