316 



Royal Society 



u 



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B 



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 d 



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 w 

 2 



42 



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o 



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13 



m 

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V*3 



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 ^ O 



t> CD . 

 w O fl 



x*^ 2 



° 5 

 S c§ 



b § 



on s 



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9 cc 



3 bC 





« 



ft 



^ 



S 



fi^ 



OSS 



2-g 



§ a 



izj.g 







186-8. 











o 









I. 



Dec. 30. 





103-7 



94-1 



110 



19 









II. 



„ 31. 



1869. 





85-1 



85-8 



99-2 



33 









III. 



Jan. 1. 





67-5 



73-1 



92-1 



47 









IV. 



„ 21. 





34 



41-9 



81-1 



79 







Occasional clouds. 

 / White frost. Mirrors became 



V. 



„ 26. 





83 



96-7 



85-8 



15 



o 



56 





J dewed ; but the readings 

 ] taken after this took place 

 ^ have been rejected. 



VI. 



Mar. 23. 



34 



57 



67-7 



84-2 



57 





40 



Occasional clouds. 



VII. 



„ 27. 



49 



115 



99-6 



115 



5 



35 



15 



f Occasional clouds, strong 

 \ gusts of wind. 



VIII. 



„ 28. 



35 



113 



96-1 



117 



16 



30 



49 



f No note of cloud, very little 



\ breeze, generally calm. 



f Moon low, sky covered with 



IX. 



„ 31. 





17 



62-8 



27-7 



58 



18 



31 



1 hazy clouds, through which 

 ] the moon was seen withmuch 

 I diminished brilliancy. 

 ["Very clear and calm, but 

 1 moon low; no perceptible 

 1 impulse imparted to the 

 [ needle. 



X. 



April 14. 







8-3 





123 





4 







































f Wind blowing strong into 



XI. 



„ 17. 



27 



13-1 



16-6 



79 



110 



27 



65 



< the mouth of the tube nearly 



[ the whole time. 



f No note of cloud till just at 



XII. 



„ 19. 



43 



35-5 



36-3 



96 



85 



25 



14 



< the end of these observa- 

 [ tions. 



XIII. 



„ 20. 



85 



33 



48-8 



68 



72 



35 



51 



f A very little wind ; occasional 



\ clouds. 



/Halo with hazy clouds ; 





















XIV. 



„ 22. 



38 



121 



75-5 





45 





15 



J moon seen through them 

 ] with much-diminished bril- 

 ls liancy. 

 Frequent passing clouds du- 





















XV. 



,, 24. 



28 



84 



95-3 



88-2 



18 



30 



29 



• ring the latter part of these 



observations. 

 ' No cloud visible, but haziness 



XVI. 



„ 25. 



45 



88-4 



99-4 88-8 



6 



25 



66 



• suspected, as it existed both 

 at sunset and at sunrise. 



1 



2 



3 



4 



5 1 6 



7 | 8 



9 



We have then Q (quantity of heat coming from the moon's surface) 



= C 



J; 



cos 0. cos (e— 6)d0 



IT 



2 



= 2 {tt — e . cos e-f sin e}*, 

 * This formula is based on the assumption that the heat coming to the eaith 



