Extra Meteokological Observations, 1843. 



315 



ACTINOfilETER. 



Makerstoun 



Mean Time 



of 



First Reading. 



In Sun 



Shade. 



Observation. 



Besun- Ended. 



Sc- divj Sc. div 



Change 

 in 

 60=. 



Effect 



of 



Sun. 



Mean 



of 

 Group 



Sc. div. 



Sun's 

 Alti- 

 tude. 



39-6 



371 



40-5 



40-4 



September 7, 1843. 



7 22 58 22 



59 52 



23 1 22 



3 22 



4 22 



7 23 



8 22 



9 52 



11 22 



12 52 

 14 22 



390 



39-4 



Makerstoun 



Mean Time 



of 



First Reading. 



In Sun 



Shade. 



Observation. 



Begun 



Ended. 



Change 

 in 

 60". 



Sc. <Uv. 



Effect 



of 



Sua. 



Mean 



of 

 Group, 



Sc. div. 



Sun's 

 Alti- 

 tude. 



40-2 



40-2 



39-4 



3S-1 



36-1 



Sept. 5^ l*" G*". Dry thermometer 65°-4 ; wet thermometer 58°*9 ; cirro-strati gathering to NW. 



Sept. 5<* 1^ 40'». Dry thermometer 66°-2 ; wet thermometer 57°'ii ; cirro-cumuli in strata covering the sky, and near the Sun. 48"*. Cirro- 

 cumuli on the Sun, and in zenith. In all the shade observations the screen was placed near the instrument, but changed every observation. 



Sept. Q^ 23'' 30°>. Sky clear near the Sun ; a few mottled cirri near the Sun ; wind blowing 0*3 lb. from SW. In the shade observa- 

 tions the screen was placed at a distance of IS inches from the instrument. 23'' 35"'. Dry thermometer 66°'8 ; wet thermometer 57°'6. 



Sept. 7*> 0'' 20*". Dry thermometer G?"^-? ; wet thermometer 58^-0. O"* 22™ 50^, At this Sun observation the instrument was exposed 

 90* instead of 60* ; the reading at 23"° 50= has been obtained by taking f of the rise in 90*. [ligbt breeze. 



Sept. T*' 23'' 2'". Dry thermometer Tl"'! ; wet thermometer 62°'8 ; a few patches of mottled cirri and cirro-strati, but not near the Sun ; 



Sept. 7^ 23*^ 12™. Sky as before ; brownish haze on horizon ; breeze ; dry thermometer 72°'5 ; wet thermometer 63°'5. 



Sept. S*' 0'' 6°*. Dry thermometer 73°-0 ; wet thermometer 64°'3. Breeze at C" 2™ ; calm at lO"', 



Sept. S** O'' 43'". Dry thermometer 73°'8 ; wet thermometer 65°1 ; curled cirri coming up from NW. 



Sept. 8* !*> 12™. Dry thermometer 75°-3 ; wet thermometer 65°'5. 



Sept. 8* lb SS"". Strips of cirri approaching the Sun. 41™. Dry thermometer 76°-0 ; wet thermometer 66°-l. 48°". Reticulated cirri 

 approaching the Sun very nearly ; some of the finer filaments have perhaps already reached it. 



