126 



THE ROYAL SOCIETY OF CANADA 



of testing further some of the recent developments in hygrometry, 

 especially with reference to their adaptability for practical use. A few 

 of these have been discussed in a former paper. ^ Three tables are given 

 below which indicate some of the results being obtained. 



In Table I, a list of sample comfort factors is given in order to 

 show^ the magnitude and variation of this quantity under various 

 atmospheric conditions at Ste. Anne de Bellevue. A number of 

 observations have been selected for Table II which demonstrate the 

 usefulness of the comfort factor in cases where the temperature and 

 humidity observations are distinctly misleading. 



The results of some tests with a simple absolute hygrometer, 

 designed by the writer,- are shown in Table III. This hygrometer 

 consists essentially of a paper, moistened with a highly deliquescent 

 solution and arranged to indicate directly the existing vapour pressure 



by its weight. 



Table I. 

 Sample observations of the "comfort factor" under various conditions at Ste. Anne de 



Bellevue, Que. 



Feelings 



Comfort factor. 



(Rate of heat loss from wet bulb 



of kata-thermometer per sq. 



cm. per sec.) 



Indoors in Winter (Observer still) — 



1. Very uncomfortable: Hot, dry, still 



2. " 



3. Uncomfortable. 

 4. 



5. Fairly comfortable. 

 6. 

 7. Comfortable. 



Cold, dry, draughty. 



Hot, dry 



Cold, dry 



Warm, dry 



Cool, dry 



Warm, dry 



Outdoors in Winter (Observer walking). 



8. Very uncomfortable. Very cold and windy 



9. Uncomfortable. Cold and windy 



10. Fairly comfortable. Cold, dry, still 



Indoors in Summer (Observer still) 



11. Very uncomfortable. 



12. Uncomfortable. 



13. p'airly comfortable. 

 1-1. Comfortable. 



15. 



Hot, moist, still. . . . 

 Warm, moist, still. , 



Warm, dry 



Warm, dry, briskly 



ventilated 



Pleasantly cool, still 



Outdoors in Summer (Observer walking). 



16. Very uncomfortable. Hot, moist, still. . . . 



17. Uncomfortable. Warm, moist, still. . 



18. Fairly comfortable. Warm, dry 



19. Comfortable. Warm, dry, breezy. . 



20. " Pleasantly cool, still. 



^N.B. 



11 millicalories (and — ) 



30 



13 



25 



16 



20 



18 



54 

 45 

 40 



10 

 14 

 16 



23 

 22. 



15 

 17 

 24 

 26 

 30 



+) 



-) 



In the above table it should be noted that a normal circulation of air is 

 assumed in those cases where the terms "still", "breezy", etc. are not men- 

 tioned.) 



iShaw, Trans. Roy. Soc. Can. Ser. HI, Vol. X. pp. 85-93, (1916). 

 2Shaw, loc. cit. p. 88. 



