OBSERVATIONS WITH THE ZENITH TELESCOPE. 



139 













Levels. 





Corrections. 









Star. 



J? 



Jlf/'cromeifir. 



c 



A 



B 



i{6 + 6') 



Micrometer. 



6 



i 



r 



Mer 



Latitude. 



mom. 



A ii si- 







i 









/ // 

















ll) 



Ill 7 



K 



19.2G33 



16.6047 



— 49 



+1.2 



— .4 



40 37 29.79 



— 1 7.08 



+ 4 



+ 14 



— 2 



6 



40 30 32.93 



64.8 





8 





18.3123 



23.8263 



+ 51 



— .6 



— .1 



40 34 3.08 



+ 219.56 



— 9 



— 11 



+ 4 



6 



32.54 



64.8 





9 





13.8397 



28.7437 



+168 



—1.3 



—1.2 



40 42 40.53 



— 6 17.30 



+ 22 



- 35 



—10 



5 



23.05 



65.0 





IV 1 



R 



19.5483 



21.9500 



+ 15 



-1-2.1 



1 .7 



40 37 23.23 



— 1 0.77 



+ 3 



+ 43 



— 2 



13 



23,03 



62.0 





3 





23.3017 



20.4440 



+ 21 



— .1 



1 .7 



40 37 9.86 



— 47.03 



+ 2 



+ 7 



— 3 



11 



23.01 







3 





29.1583 



13.5593 



+184 



— .0 



— .5 



40 29 47.52 



+ 6 34.91 



— 23 



— 6 



+13 



7 



22.33 



61.5 





4 





18.8640 



24.8460 



+ 98 



—1.3 



— .5 



40 38 54.16 



— 2 31.51 



+ 8 



— 27 



— 5 



10 



22.51 







5 





28.2740 



12.1780 



+ 24 



— .3 



-1 



40 29 35.25 



| 6 47.10 



— 24 



— 3 



-(-13 



6 



22.26 







6 



T) 



29.4143" 



10.9210" 



— 2 



—1.1 



1.0 



40 28 34.25 



1 7 47.63 



| 1.00 



— 30 



+13 



5 



22.76 



62.1 





7 





13.8157 



27.9407 



-1-108 



1 -!» 



— .3 



40 30 25.00 



+ 5 57.45 



— 21 



1 10 



10 



6 



22.50 







8 





33.7157 



1.6.8823 



+771 



! LI 



.5 



40 43 30.29 



— 7 7.61 



| 24 



+ 29 



—13 



7 



23.15 







9 





14.8993 



19.1410 



—109 



— .4 



+1.7 



40 38 9.74 



— 1 46.98 



6 



+ 16 



— 8 



11 



23.06 







10 





15.5310 



25.5287 



+ 43 



— .8 



+ -3 



40 40 36.23 



— 4 12.92 



+ 14 



— 10 



— 7 



6 



23.34 



59.8 





II 





5.6850" 



32.4977 1 ' 



— 55 



+1.0 



+ .3 



40 25 3.38 



+11 17.87 



+ 88 



-I- 20 



+20 



6 



22.59 



59.3 



Adjustment of the .Latitude. 



In case every pair of a given group lias been observed on any night, the mean of 

 the resulting latitudes will be based upon the mean value of the declinations of all stars 

 of this group. The differences between the individual values and the mean of all will 

 furnish the corrections required to reduce the individual latitudes to the mean system. 

 These corrections will only be required in case of failure to observe! one or more of the 

 pairs forming the group. 



In order to avoid errors resulting from outstanding uncertainties as to the value of 

 the micrometer screw, it is desirable that the pins and minus corrections of each group 

 shall balanee as nearly as maybe. This condition cannot be fully realized, at least not 

 for any considerable time, owing to the effect of precession. The following tabular state- 

 ment gives the approximate values of these corrections, in terms of micrometer revolu- 

 tions, for each group of this series. 





Beginning. 



End. 





1 



II 



ill 



IV 



I 



II 



ill 



IV 



Pair . 1 



—15.3 



— 6.4 



—15.8 



— 1.3 



—15.4 



— 6.4 



—16.4 



— 2.1 



2 



1-4.2 



— 5.1 



—34.4 



— 0.7 



-|- 4.0 



— 5.1 



—25.0 



— 1.6 



3 



—14.2 



+ 2.5 



1-25.2 



[+16.8] 



—14.4 



! 2.5 



-1-24.4 



[+15.9( 



4 



— 3.5 



— 2.1 



-1-25.0 



— 4.8 



— 3.6 



— 2.1 



+24.2 



— 5.7 



5 



■1 8.3 



- 0.3 



+11.7 



-(17.4 



+ 8.3 



— 0.3 



+10.9 



1-16.4 



6 



+ 6.7 



—22.9 



— 3.5 



+19.8 



+ 6.8 



—22 9 



— 4.4 



+18.8 



7 



—16.1 



[-11-7] 



— 1.4 



+15.4 



—16.1 



[-11.7] 



- 2.4 



+14.4 



8 



+ 6.4 



| 20.9 



+ 6.8 



—15.6 



+ 6.5 



-1-20.8 



+ 5.8 



—16.6 



9 



— 5.3 



1 ! 3.51 



—13.6 



— 3.0 



— 5.2 



[+ 3.5] 



—14.7 



— 4.0 



10 



-1 21.4 



+16.0 





— 8.7 



| 21.6 



-1-15.9 





— 9.8 



11 









1 1 28.1] 









[+27.1] 



12 









—11.5 









—12.6 



Mean . . . —0.7 

 Omitting brackets 



+ 



0.6 

 0.3 



+ 1.1 



4.3 

 0.4 



— 0.7 



+ 



1.0 

 .3 



3.3 

 0.1 



