1882.] H. F. Blanford — Somefurtlier results of tie sun-thermometer. 77 



\ 



^ I 



1877 





640 



61-6 



61-7 



612 



570 



661 



... 



57-5 



59-8 



57-9 



78 



61-4 



63-5 



627 



64-2 



61-0 



66-9 



578 



... 



59-2 



59 3 



60-0 



79 



61 3 



62 2 



636 



62-6 



615 



56-8 



59-9 



... 



605 



587 



62-2 



80 



601 



60-2 



619 



61-9 



60-4 



67-9 



59-8 



... 



624 



59 9 



587 



81 



610 



619 



66-6 



63-2 



60-5 



59 4 



63-3 



... 



62-1 



58 8 



607 



Mean 



60-9 



62 4 



633 



62-7 



60 9 



57-6 



59-4 



... 



60-3 



593 



59 9 



59 3 



60 7 

 600 

 59-1 

 590 



59-8 





H5 



1 



1 



< 



^ 

 ^ 



i 



3 



be 



4 



A 



1877 





63-6 



65 3 



640 



61-6 



58-6 



78 



59-9 



61-9 1 611 



61-6 



589 



525 



79 



56 1 



592 



627 



555 



489 



47-3 



80 



575 



64 9 



59 6 



60-2 



55-7 



51-3 



81 



58-4 



61-4 



64-5 



626 



55-9 



48 



Mean 



58 



62-2 



626 



60-8 



56 2 



51-6 



57-4 

 48-8 

 46 9 



50 5 

 50-2 



50-4 



57-2 



48 7 

 50-6 

 54 8 

 56-9 



53-6 



57 7 

 54-6 

 53-5 

 57-8 

 56-7 



54-9 



587 



58-8 



557 



54 9 



53-2 



535 



584 



55 2 



551 



531 



56 2 



551 



58-0 

 551 



53-5 

 57-2 



50-8 



54-9 



It is evident, on a simple inspection of the above table, that the 

 intensity of the insolation, on days apparently equally clear, undergoes 

 a distinct annual variation. And moreover, that this Tariation is not 

 determined by the thickness of the atmosphere traversed by the sun's rays, 

 as the sun varies in declination ; since it is different in character at 

 different stations ; and at some stations, viz, Allahabad, Vizagapatam and 

 Bombay, is greatest in the winter, when the sun is at or near its lowest 

 altitude, and the absorbing atmospheric layer, therefore, at its thickest. 

 Its character, at the several stations enumerated in Table II, is best shewn 

 in Table III, which exhibits the monthly anomaly of each station, com- 

 puted on the general average of the months under consideration ; i. e., 

 not an annual mean, but the mean of as many monthly mean values as 

 are shewn in Table II. 

 Table III. — Annual variation of insolation excess temperature on clear 

 {or hut slightly clouded) days. 



Fr 





3 



to 



< 















t-^ 



f;l 





1 



1 





-M 



o 



O 





P4 



^ 



O) 



OJ 



O 



^ 



p 



Vizagapatam 

 Sironcha . . 

 Bombay 

 Jessore 

 Hazaribagh . 

 Allahabad .. 

 Sirsa 

 Peshawar . . 



+ 2.2 

 —0-2 

 + 0-7 

 —0-6 

 —02 

 + 1-4 

 + 0-3 

 + 16 



+ 1-3 

 —1-0 



+ 1-7 

 —0-1 

 -06 

 + 2-0 

 + 1-8 



—1-9 

 —26 



+ 0-5 

 —12 

 —06 



+ 05 



+ 2-7 



+ 5-8 +6-2 



-3-6 

 -1-2 

 -0-5 



-2-2 

 + 0-3 

 —11 

 + 2-1 



+ 4-4 



-3-5 

 — 1 

 —1-6 

 —11 



+ 0-3 

 —2-1 



-3«2 



+ 3—30 



-02- 4-8 



-1-2 

 6-0 



-2-8 



-0-3 

 -15 



+ 0-2+26 

 + 2-8 +3 1 



—0-1 

 + 3-4 

 + 1-5 

 -0-2 

 -13 

 —02 



—08 

 + 1 1 

 —0.2 

 + 0-7 

 -0-7 

 —1-3 



+ 2-8 27-9 

 + 0-2 57-3 

 + 3 48 3 

 + 0-8 55-9 

 —0656-8 

 + i-6;58-7 

 —1-060-6 

 — 1-5;56-4 



