1867.] Insolation to Atmospheric Hamidity, 361 



Table VI. 



Mean Results of Actinometer-observations at Greenwich, jMarch and 



April 1864. 



iViUl^tll alllX 



day. 



iTlcall dUial 



time. 



Mean results 

 in scale-di- 



AlfJfnrlp of 



sun. 



State of sl(y. 





h m 









March 23. 



2 29 



18-7 



30 



Light cirri. 



15. 



22 23 



14-2 



32 



Cloudless. 



18. 



2 9 



21-1 



32 



Clear. 



18. 



36 



20-4 



36 



Clear. 



24. 



1 32 



17-0 



36 



Clear. 



15. 



23 51 



19-1 



37 



Clear. Light cloud. 



April 15. 



2 26 



27-1 



37 



Clear. 



20. 



2 28 



25-5 



38 



Light cirri prevalent. 



March 24. 



49 



14-3 



39 



Clear. 



Means. 





19-4 



35 



Clear. 



Table YII. 



Mean Results of Actinometer-observations at Greenwich, August and 

 September 1864. 



Month and 

 day. 



Mean solar 

 time 



Mean results 

 in scale- di- 

 visions. 



Altitude of 

 sun. 



State of sky. 



August 30. 



September 14. 



14. 



August 26. 



26. 



29. 



5. 



h m 



3 26 



22 8 

 22 12 

 3 

 2 55 



2 39 



3 3 



41-6 



43-3 

 34-7 

 38-3 

 32-4 



40- 1 



41- 7 



o 



30 1 



34 

 35 

 35 

 36 



36 1 

 39 



Cloudless (thunder 

 in evening). 



Sun free from cloud. 



Light cirri over sun. 



Sun free from cloud. 



Sun free from cloud. 



Clear (amount of 

 cloud in afternoon 9, 

 cirrocumuli, cirrus). 



Cloudless. 



Means 





39-6 



35 



Cloud genera he- 

 sent. 



Of the very few observations in May and July which were available for 

 comparison, the scale-readings in July were found to reach far higher values 

 than in May *. 



* The observations at altitudes between 24° and 29° in March and October showed 

 similar results. Below 24° and above 60° there were no observations that were com- 

 parable. 



