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On the Errors Involved in the Determination of Cooling Powers and Air Velocities with a Kata-Thermometer

Published online by Cambridge University Press:  15 May 2009

O. J. Cockerell
O. J. Cockerell
Affiliation:
National Institute of Industrial Psychology
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During the experimental comparison of different types of hot-water heating systems in a school at Easter 1934 about a thousand kata readings were taken. These were taken mostly in pairs, one immediately after the other, and a third reading was taken only when the first two differed by more than about 10 per cent.

Type
Research Article
Information
Journal of Hygiene , Volume 35 , Issue 2 , May 1935 , pp. 255 - 261
Copyright
Copyright © Cambridge University Press 1935

References

page 256 note 1 The normality of these curves has been tested by calculating the values of √β1 and β2−3. √β1 is insignificant for all these distributions but β2−3 is 2½ times its standard error for the air velocity group 20–49 feet per minute and four times its standard error when all the readings are taken together. Thus the distribution curves are not significantly skewed but for air velocities above 20 feet per minute the distributions are slightly leptokurtic.

page 256 note 2 For this distribution both √β1 and β2−3 are less than their standard errors.

page 260 note 1 This formula has been taken from the paper by Bedford, T. and Warner, C. G. (1933: The influence of radiant heat and air movement on the cooling of the kata-thermometer. J. Hygiene, 33, 330–48), but HR has been substituted for HRT, the emissivity E has been put equal to 0‐9, and the corresponding alterations made in the constant.CrossRefGoogle ScholarPubMed