106 



Herman Schultz, 



NOTE III. 



A list is here given of the nights of observation together with their atmospherical 

 conditions, which it is of great importance to know, since they in these more even than 

 in other observations indicate the weight to be attributed to each determination. More- 

 over the coincidences of the spider-lines obtained for every evening are here given, 

 in order to enable the reader, by a comparison of these with the definitive coincidences 

 registered above, to estimate the accuracy of the last mentioned. 



The different columns in the following table contain respectively: 

 Col. 1 and 2: The numerical succession and date of the nights of observation. 

 Col. 3: Position of the telescope. 



Col. 4: Coincidences of the spider-lines. The numbers beside the coincidence-numbers in- 

 dicate upon how many simple coincidences the coincidence given in the table depends. 

 Col. 5: Mean temperature in the Cupola during the observation. 



Col. (> and 7: Character of the atmospheric conditions during the observation. Here 

 col. 6 gives, according to the known rule, a general graduation of favourable- 

 ness of the atmosphere's condition, indicated by the numbers 1, 2, 3, 4. 







fed 



Coincidence 







Remarks on the images and state of 





Date 



g5 



of 



Temp. C. 











o 



Microm. 





the atmosphere 





1863 













1 



Febr. 17 



II 



35',118 (2) 







3 



Images very unsteady. Windy. 



2 



Febr. 19 



II 



34,197 (4) 



-1,5 



3 



Images unsteady. Windy. 



3 



Febr. 28 



ii 



35,133 (3) 



+ 1,5 



2.3 



Variable. Moonlight. Windy. 



4 



March 23 



I 



34,1(57 (2) 





3 



Unsteady and dull images. Aurora. Moon. 









34,158 (3) 



+ 1,8 







•| 



March 24 



1 



43,250 (2) 



3 



Windy. Moon. Cirrhi. 



6 



March 25 



ii 







3.4 



Windy. 





March 31 



II 



35,131 (2) 



-2,5 







7 ! 



42,276 (4) 



2 



Very strong moonlight. 



8 



April 9 



I 



34,150 (4) 



+ 1,5 



3 





9 



April 12 



I 



35,281 (4) 



+ 2,0 



2.3 



Images very unsteady. 





April 13 



I 



35,296 (2) 



+ 2,0 







,.j 



35,311 (1) 



2 



Calm ; but images tremulous. 



11 



April 14 



I 



34,231 (2) 



+ 3,0 



2 



Perfectly calm, but images very tremulous. 



12 



April 15 



I 



35,167 (2) 



+ 4,8 



2 



Calm; images tremulous and not very well defined. 













Very strong aurora. 



13 



April 17 



I 



34,217 (2) 



+ 5,0 



2.3 



Windy. Images tolerably steady and well defined but 

 dull. Aurora. 



14 



April 19 



I 



34,223 (2) 



4 5,3 



3 



Cirrhi; windy; images dull and unsteady. 



15 



April 22 



I 



34,228 (1) 





2.3 



Cloudy. Strong gale — chronometer difficult to hear. 

 Moon. Observation interrupted by clouds. 



16 



April 24 



I 



27,458 (2) 



+ 1,2 



1.2 



Atmospheric state variable : for the most part perfectly 













clear, but images extremely tremulous. Moon. 



