Extra Meteorological Observations, 1845. 



281 



actinometer. 



In Sun 



or 

 Shade. 



Observation. 



Begun. 



Ended. 



Sc. div. Sc. div. 



Change 

 in 

 60^ 



So. div. 



Effect 



of 



Sun. 



April 22. 



Shade 



36-3 



330 



-3-3 



Sun 



35-3 



40-8 



+ 5-5 



Shade 



39-7 



36-4 



-3-3 



Sun 



38-8 



44-0 



+ 5-2 



Shade 



42-5 



38-8 



-3-7 



Sun 



40-9 



461 



+ 5-2 



Shade 



44-5 



40-9 



-3-6 



Sun 



22-8 



28-0 



+ 5-2 



Shade 



26-8 



23-4 



-3-4 



Sun 



25-6 



30-4 



+ 4-8 



Shade 



29-1 



25-7 



-3-4 



Sun 



27-8 



32-9 



+ 5-1 



Shade 



31-4 



27-7 



-3-7 



Sun 



29-7 



34-3 



+ 4-6 



Shade 



32-3 



27-8 



-4-5 



Sun 



29-7 



33-9 



+ 4-2 



Shade 



320 



27-7 



-4-3 



Sun 



29-4 



33-9 



+ 4-5 



Shade 



31-9 



27-4 



-4-5 



Sun 



29-2 



33-6 



+ 4-4 



Shade 



31-9 



27-9 



-4-0 



Sun 



29-8 



34-3 



+ 4-5 



Shade 



32-6 



28-4 



-4-2 



Sun 



30-2 



34-8 



+ 4-6 



Shade 



331 



29-2 



-3-9 



Sun 



311 



35-6 



+ 4-5 



Shade 



33-7 



29-3 



-4-4 



Sun 



31-0 



35-3 



+ 4-3 



Shade 



33-5 



29-3 



-4-2 



Sun 



31-2 



35-9 



+ 4-7 



Shade 



340 



29-7 



-4-3 



Sun 



31-5 



36-0 



+ 4-5 



Shade 



34-2 



30-0 



-4-2 



Sun 



31-9 



36-6 



+ 4-7 



Shade 



34-8 



30-9 



-3-9 



Sun 



32-8 



37-4 



+ 4-6 



Shade 



35-7 



31-5 



-4-2 



Sun 



33-3 



38-0 



+ 4-7 



Shade 



36-3 



32-6 



-3-7 



Sun 



34-6 



39-1 



+ 4-5 



Shade 



37-6 



33-7 



-3-9 



Sun 



35-4 



39-8 



+ 4-4 



Shade 



38-1 



34-0 



-4-1 



Sun 



35-7 



39-9 



+ 4-2 



Shade 



38-3 



34-2 



-4-1 



Sun 



35-9 



40-3 



+ 4-4 



Sc. div. 



Mean 



of 

 Group, 



Sc. div. 



8-80 



8-58 



8-62 



8-76 



^8-58 



8-74 



.8-74 



>8-56 



8-36 



Sun's 

 Alti- 

 tude. 



37-6 



368 



36-0 



351 



34-2 



33-3 



32-4 



31-5 



30-6 



Makerstoun 



Mean Time 



of 



First Reading. 



<\. h. m. 



In Sun 



or 

 Shade. 



Observation. 



Begun. 



Sc. div. 



Ended, 



Change 

 in 

 60'. 



Sc.div. I Sc. div. 



Effect 



of 



Sun. 



Sc. div. 



Mean 

 of 



Sun's 

 Alti- 



Group. tude 



Sc. div. 



22 



22 

 22 



4 21 

 22 30 



24 



25 30 



27 



28 30 



30 



31 30 

 33 



22 5 



33 



34 30 



36 



37 30 



39 



40 30 



42 



43 30 



45 



46 30 

 48 



59 

 30 



2 

 3 

 5 

 6 

 8 

 9 

 11 



12 30 



14 



15 30 



17 



18 30 



20 



21 30 



23 



24 30 



26 



27 30 



29 



30 30 



32 



33 30 

 35 



36 



30 



38 







39 



30 



41 







April 22. 



Sun 



21-3 



24-7 



+ 3.4 







Shade 



23-3 



19-9 



-3.4 



6.7 ■ 





Sun 



21-3 



24-6 



+ 3-3 



6.8 





Shade 



231 



19-6 



-3-5 



6.7 





Sun 



20-8 



24-0 



+ 3.2 



6.7 



^6.66 



Shade 



22-7 



19-3 



-3.4 



6.6 





Sun 



20-6 



23.8 



+ 3-2 



6.6 





Shade 



22-4 



19-0 



-3-4 



6.5 





Sun 



20-0 



231 



+ 31 







Sun 



22-4 



25-3 



+ 2-9 







Shade 



25-0 



23-7 



-1-3 



3.9 





Sun 



24-7 



270 



+ 2-3 



3.7 





Shade 



26-4 



24-9 



-1-5 



3-8 





Sun 



25-8 



28-2 



+ 2.4 



4.1 





Shade 



27-6 



25-8 



-1-8 



4.1 



3.93 



Sun 



26-8 



290 



+ 2-2 



3.9 





Shade 



28-3 



26-6 



-1-7 



40 





Sun 



27-4 



29-7 



+ 2-3 



4.0 





Shade 



28-8 



27-0 



-1-8 



3-9 





Sun 



27-6 



29-5 



+ 1-9 







Sun 



19-6 



2M 



+ 1.5 







Shade 



20-2 



18-1 



-2-1 



3-5 





Sun 



18-6 



19-9 



+ 1.3 



3.4 





Shade 



190 



16-9 



-2.1 



3.5 





Sun 



17-3 



18-9 



+ 1-6 



3.8 





Shade 



18-2 



160 



-2-2 



4-1 



3-48 



Sun 



16-6 



18-8 



+ 2-2 



4.0 





Shade 



18-4 



170 



-1-4 



3.2 





Sun 



17-8 



19-3 



+ 1.5 



2.9 





Shade 



19-1 



17-7 



-1.4 



2.9 





Sun 



18-4 



20-0 



+ 1.6 



3-0 





Shade 



19-4 



18-0 



-1-4 



3.0 





Sun 



190 



20-6 



+ 1.6 



3-3 





Shade 



20-1 



18-2 



-1-9 



3.3 





Sun 



18-6 



19-8 



+ 1.2 



2.9 



3.10 



Shade 



19-3 



17-7 



-1-6 



30 





Sun 



17-9 



19-4 



+ 1-5 



3-2 





Shade 



19-0 



17-1 



-1.9 



32 





Sun 



17-3 



18-3 



+ 1.0 



30 





Shade 



17-4 



15-2 



-22 



2-8 ■ 





Sun 



151 



15-3 



+ 0.2 



2.5 





Shade 



14.3 



11-9 



-2.4 



25 





Sun 



11-9 



11-9 



0.0 



1-7 





Shade 



22-7 



21-7 



-I-O 



0.5 



1-77 



Sun 



21-4 



20-4 



-1.0 



06 





Shade 



19-5 



17-3 



-2-2 



1-7 





Sun 



17-0 



16.9 



-0.1 



1-9 





Shade 



15-9 



140 



-1-9 



1-7 





Sun 



13-8 



13-5 



-0.3 







22.9 



12.6 



9.0 



7-2 



5.4 



ipril 22* 3^ 20™. The spot of moisture, which has been inside the plate-glass cover since about the commencement of this series (l"" 55™), 

 II the middle of the plate of glass, oval shaped, about 1| inch long and f inch broad. 



vpril 22<i S'^ 35™. At the end of this series of observations it was found that there was a small globule of air in the bulb of the actino- 

 ffier about one-tenth of an inch in diameter. 



pril 22d SI" 36™. A slight milkiness in the sky to westward ; the sun tolerably favourable. 



Lpril 224 5h 59m_ rpfje observations after this time were made on the roof of the Observatory, the actinometer being put into the shade 

 lowering it below the parapet wall, 

 ipril 22* 6'' 33™ 15'. The screw turned in a little. Trees intervened after 6^ 42™, preventing further observations. 



MAG. AND MET. OBS. 1845. 



4b 



