376 



S. A. Hill — Fsyclirometer and Condensing Hygrometer. [No. 4, 

 Table II. — Deduced Results. 







From 



By August's Formula. 



, -48 {t-t') h 



'' 1130 1' 



Difference 





BO 



s' 



^ 



Dew Point. 



computed- 



—observed. 



A- ^'-^ 





a 







^ rt 



ti- 











XJl 



!^ 



1-2 



*"i^ 



Yapour 



Relative 



Yapour 



Relative 











1 a 

 ^5 



tension. 



Humidity. 



tension. 



Humidity 









// 



7o 



// 



7 



/o 











1 



•2669 



32 



•2669 



33 



+ ^0040 







•00083 



I— 1 



2 



•1411 



19 



•1859 



25 



+ -0448 



+ 6 



•00098 



g 



3 



•2659 



53 



•2709 



53 



+ -0050 







•00084 



C- 



4 



•2109 



43 



•1996 



41 



-•0113 



- 2 



•00072 



1— i 



5 



•3808 



55 



•3935 



56 



+ -0127 



+ 1 



•00092 





1 



•2298 



15 



•3330 



22 



+ •1032 



+ 7 



•00106 





2 



'2406 



16 



•3359 



22 



+ •0953 



+ 6 



•00105 





3 



•2068 



9 



•1555 



7 



-•0513 



- 2 



•00073 





4 



•1716 



8 



•1462 



6 



- -0254 



- 2 



•OC077 





5 



•1679 



23 



•2567 



35 



+ •0888 



+ 12 



•00124 





6 



•1442 



19 



•2370 



31 



+ -0928 



+ 12 



•00121 





7 



•1071 



14 



•1260 



16 



+ ^0189 



+ 2 



•00087 





8 



•3359 



65 



•3553 



69 



+ ^0194 



+ 4 



•00105 





9 



•3083 



59 



•3049 



58 



- ^0034 



- 1 



•00077 



0? 



10 



•3015 



58 



•3344 



64 



+ -0329 



+ 6 



•00117 



CO 

 00 



11 



•2361 



27 



•2952 



34 



+ •0591 



+ 7 



•00107 



I—i 



12 



•1837 



30 



•1871 



31 



+ ^0034 



+ 1 



•00082 



(—1 



13 



•1830 



29 



•1832 



29 



+ ^0002 







•00082 





14 



•2946 



24 



•3850 



32 



+ ^0904 



+ 8 



•00112 





15 



•2846 



22 



•2728 



21 



-•0118 



- 1 



•00077 





16 



•4280 



26 



•4822 



30 



+ ^0542 



+ 4 



•00097 





17 



•3936 



24 



•4208 



26 



+ -0272 



+ 2 



•00089 





18 



•4156 



58 



•4863 



68 



+ ^0707 



+ 10 



•00119 





19 



•3979 



56 



•4096 



57 



+ •0117 



+ 1 



•00090 





20 



•3993 



56 



•4415 



62 



+ ^0422 



+ 6 



•00118 





21 



•8931 



87 



•9013 



88 



+ -0082 



+ 1 



•00100 





22 



•9261 



92 



•9240 



92 



-•0021 







•00075 



If we neglect the variations of L, wliicli are not great for the range 

 of temperature with which we have to deal in Indian meteorology, the 

 mean value of A, in the formula adopted, for centigrade degrees and or- 

 dinary temperatures is about "00080 ; or, if we include these variations, 



A ranges from '00077 to -00082. The theoretical value when ^ = 0-38 is 



•00063. With these may be compared some other results by the same 



and other observers : — 



Apjohn, -00063 



Regnault, in still air -00128 



Do. in open air with wind '00074 



