on the Temperature of the Sun. 



539 



From amongst the number of observations made from the 

 month of August till December, I shall only give those of 28th 

 and 29th September, which were very favourable, because the 

 sky kept clear and the air was tranquil and very transparent. 



Table VI. 



Observations on the Thermal Radiation of the Sun, 28th of 

 September, 1877. 





Distance from 



Deflections of 





Time. 



zenith. 



galvanometer. 



Hygrometer. 





z, 



y- 





h m 





div. 





8 30 



64 54 



188-0 



89 



9 



60 42 



1910 



89 



10 



53 27 



2020 



86 



11 35 



47 36 



209-2 



82 



12 



47 34 



2100 



80 



1 



50 12 



207-0 



74 



2 15 



57 23 



1910 



71 



3 



63 23 



184-5 



68 



4 



72 43 



164-0 



69 



4 35 



78 36 



1310 



76 



Table VII. 

 29th September. H=768, *=16°*5 C. 





Distance from 



Eeading on 





Time. 



zenith. 



galvanometer. 



Hygrometer. 





Z. 



y- 





h m 





div. 





8 45 



63 48 



180-5 



925 



9 5 



60 22 



186-5 



925 



9 35 



56 36 



1920 



920 



10 5 



53 21 



1970 



91-0 



10 35 



50 48 



2000 



900 



11 5 



49 



2010 



88-5 



11 35 



48 



204-5 



86-0 



12 2 



48 



205 



820 



1 40 



53 48 



1900 





2 5 



56 36 



189-0 



740 



3 5 



64 30 



1740 



740 



3 45 



70 36 



155-0 



710 



4 30 



78 5 



1300 



74-0 



4 50 



81 24 



1090 



740 



Although the two days, 28th and 29th of September, were 



202 



