Instruments and methods used in radiometry - II (1913)
National Bureau of Standards · leaf 39
doubledby reducing the gas pressure from 760 mm to 0.1 mm (6 mmcathode dark space). In hydrogen at 0.1 mm the bolometer was2.5 as sensitive as in air at 760 mm pressure. With a Geryk oilpump a vacuum of 0.015 to 0.02 mm can be produced, when theradiation sensitivity is much higher. The sensitivity… … PRESS.=E CF =15 :.-- 3^3Fig. 11 fluorite window, winch was flawless and 3 mm in thickness, trans-mitted about 93 per cent of the radiation from a sperm candle.The battery current was 0.03 ampere. Using a galvanometerperiod of 10 seconds and a sensitivity of 1.4 X io-10 ampere, themean value of the…
Measurements and use of instruments · Thermometry, pyrometry and calorimetry · Heat flow, thermal and thermodynamic processes
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