144 



MR. THOMAS MACKERETH 







Exposed bk. 





Black bulb 



Difference 





Exposed bk. 



bulb therm. 





therm. 



from therm. 



Date. 



bulb therm. 



6 foet from 



Difference. 



in vacuo 



6 feet 





on grass. 



ground. 





on grass. 



from ground. 



1867, 























Oct. I 



69 2 



73-0 



+ 3-8 



83-2 



4-IO-2 





, 2 



57-5 



57-6 



4- o-i 



62-1 



4- 4'5 





. 3 



61-4 



627 



+ 1-3 



71-0 



-f 8-3 





. 4 



52"5 



57-0 



+ 4-5 



6o-o 



4- 3*o 





. 5 



66-5 



68-2 



+ 17 



72*2 



+ 4-0 





, 6 



64*0 



68-0 



+ 4"o 



677 



- o'3 





. 7 



607 



67-2 



+ 6-5 



77-4 



4-IO-2 





, 8 



54-9 



6o-i 



+ 5-2 



68-0 



+ 7-9 





. 9 



467 



45-8 



- 0-9 



48-9 



4- 3-1 





, 10 



62-0 



67-6 



+ 5-6 



75-8 



4- 8-2 





, II 



51-3 



52-5 



+ 1-2 



54"o 



+ 1-5 





) 12 



56-2 



56-5 



-f 0-3 



56-5 



o*o 





, 13 



53-4 



527 



- 07 



57-0 



4- 4-3 





, 14 



600 



61-5 



+ 1-5 



6i-2 



- o"3 





. 15 



6io 



630 



+ 2-6 



65-0 



4- 1-4 





, 16 



64-8 



74-3 



+ 9"5 



71-0 



- 3*3 





, 17 



63-0 



74-8 



+ II-8 



7I-I 



- 37 





, iS 



62*5 



707 



+ 8-2 



67-5 



- 3-2 





. 19 



57*3 



68-2 



+ 10-9 



62-0 



- 6-2 





, 20 



60-5 



689 



+ 8-4 



64-4 



- 4-5 





, 21 



6o*o 



63-8 



+ 3-8 



63-1 



- 07 





. i2 



72-8 



82-1 



+ 9*3 



79-8 



- 2-3 





. 23 



64-0 



64-8 



4- 0-8 



65-6 



4- 0-8 





, 24 



54-2 



554 



+ 1-2 



56*0 



4- 0-6 





. 25 



51-8 



52-5 



4- 07 



53'o 



+ 0-5 





, 26 



62*0 



693 



4- 7-3 



65-3 



- 4-0 





, 27 



50-3 



51-4 



4- i-i 



537 



+ 2-3 





, 28 



52-6 



61-9 



4- 9-3 



587 



- 3"2 





, 29 



59-4 



65-4 



4- 6-0 



62-0 



- 3'4 





. 30 



6i-o 



68-8 



4- 7-8 



67-0 



- 1-8 





. 31 



58-3 



648 



4- 6-5 



64-2 



- 0-6 



Mean . . . 



59-0 



62-9 



+ 3'9 



64-6 



4- 17 



VIII. Solar-radiation Observations, made at Eccles, near 

 Manchester. By Thomas Mackereth, F.R.A.S., F.M.S. 



Bead before the Physical and Mathematical Section, December 31st, 1867. 



Feeling considerable interest in the paper read by Mr. 

 Baxendell, F.R.A.S., at a recent meeting of the Physical 

 Section, and at a General Meeting of the Society _, on this 

 subject, I have reduced five years^ observations which I 



