Summary
Hygrometric measurements on room air were made with aNolan-Pollak nucleus counter from which the lining of blotting paper had been removed. The dew point can be determined from the critical overpressure for condensation on nuclei. Satisfactory agreement with the values given by a ventilated wet and dry bulb hygrometer was obtained. The correction required is small since condensation occurs on ordinary atmospheric nuclei when the temperature is brought to about 0.3°C below the dew point.
Zusammenfassung
Es wurden Feuchtigkeitsmessungen der Zimmerluft mit einemNolan-Pollak Kernzähler gemacht, in welchem das Futter aus Fliesspapier entfernt worden war. Der Taupunkt kann aus dem kritischen Ueberdruck, der für die Kondensation an den Kernen notwendig ist, bestimmt werden. Es wurde zufriedenstellende Uebereinstimmung mit den Angaben eines ventiliertenAssmann-Psychrometers gefunden. Die erforderliche Korrektur ist klein, da die Kondensation an gewöhnlichen Kernen der Luft stattfindet, wenn die Temperatur auf einen um 0.3°C verminderten Taupunkt gebracht wurde.
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References
Nolan P. J. &Pollak L. W.,The calibration of a photo-electric nucleus counter. Proc. Roy. Irish Acad., 51 A, 9–31 (1946).
Nolan P. J. & Mac Cobmaic P. S.,The nuclei produced by disruptive discharge at a water surface. Geophysical Bulletin, No. 7, School of Cosmic Physics, Dublin Institute for Advanced Studies (1953).
The measurement of humidity in closed spaces. Food Investigation, Special Rep. No. 8-Rev. Ed. Dep. Sci. and Ind. Research, London 1933.
Alnor Dewpointer, Illinois Testing Laboratories, Inc., 420 North Lasalle Street, Chicago, 10, U.S.A.
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Nolan, P.J., O'Connor, T.C. The photo-electric nucleus counter as hygrometer. Geofisica Pura e Applicata 31, 32–36 (1955). https://doi.org/10.1007/BF01999581
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DOI: https://doi.org/10.1007/BF01999581