XV111 



Introduction to the Makerstoun Observations, 1844. 



Table 1. — Determinations of the Value of Angle A. 



Date. 















Reading 



i of Horizontal Circle 













i 





For Wire of Declination Telescope. 



For North Mark. 



































Angle j\. 









Verniers 















Verniers 





























MeE 

















Mean 











A. 



B. 





C. 









A. 



B. 





C. 











1844. 



t 



// 



f 



// 



t 



// 



o 



' 



p 



f 



tf 



' 



" 



' 



// 



/ 



i 



o 



/ // 



Feb. 7 



53 



17-5 



53 



215 



53 



57-5 



233 



53 



32-2 



44 



12-5 



43 



52-5 



43 



57-5 



77 44 



0-8 



23 



50 28-6 



May 11 



52 



2-5 



51 



52-5 



52 



8-7 



53 



52 



1,2 



42 



2-5 



42 



22-5 



42 



42-5 



257 42 



22-5 



23 



50 21-3 



July 4 



52 



230 



52 



8-0 



52 



430 



53 



52 



24-7 



42 



350 



42 



52-5 



43 



100 



257 42 



52-5 



23 



50 27-8 



July 22 



52 



10-0 



52 



00 



52 



25-0 



53 



52 



11-7 



42 



27-5 



42 



51-2 



43 



2-5 



257 42 47-1 



23 



50 35-4 



Aug. 14 



52 



40-0 



52 



18-7 



52 



46-2 



53 



52 



350 



42 



400 



43 



00 



43 



200 



257 43 



0-0 



23 



50 25-0 



Aug. 14 



52 



350 



52 



7-5 



52 



47-5 



53 



52 



300 



42 



400 



43 



1-2 



43 



250 



257 43 



2-1 i 



23 



50 321 



Aug. 14 



53 



15-0 



52 



57-5 



53 



20-0 



53 



53 



10-8 



43 



23-7 



43 



52-5 



44 



50 



257 43 



47-1 \ 



23 



50 36-3 



Aug. 14 



52 



55-0 



52 



51-2 



53 



37-5 



233 



53 



7-9 



43 



15-0 



43 



2-5 



43 



100 



77 43 



9-2 



23 



50 1-3 



Aug. 14 



53 



5-0 



52 



54-0 



53 



17-5 



53 



53 



5-5 



43 



22-5 



43 



51-0 



44 



2-5 



257 43 



45-3 



23 



50 39-8 



Oct. 14 



52 



25-0 



52 



28-7 



53 



150 



233 



52 



429 



43 



100 



42 



47-5 



43 



5-0 



77 43 



0-8 



23 



50 17-9 



Oct. 14 



52 



27-5 



52 



28-7 



53 



12-5 



233 



52 



42-9 



43 



7-5 



42 



400 



42 



57-5 



77 42 



55-0' 



23 



50 121 



Oct. 14 



52 



38-7 



52 



17-5 



53 



00 



53 



52 



38-7 



42 



37-5 



42 



57-5 



43 



250 



257 43 



o-o ; 



23 



50 21-3 



Oct. 14 



52 



46-2 



52 



22-5 



52 



58-8 



53 



52 



42-5 



42 



43-7 



43 



00 



43 



250 



257 43 



2-9 i 



23 



50 20-4 



Oct. 19 



52 



11-2 



52 



13-7 



52 



58-8 



233 



52 



27-9 



42 



57-5 



42 



36-2 



42 



55-0 



77 42 



49-6 



23 



50 21-7 



Oct. 19 



52 



32-5 



52 



7-5 



52 



43-6 



53 



52 



27-9 



42 



52-5 



42 



56-2 



43 



16-3 



257 53 



1-7 



23 



50 23-8 



Oct. 19 



52 



45-0 



52 



16-2 



52 



52-5 



53 



52 



37-9 



42 



40-0 



42 



57-5 



43 



25-0 



257 43 



0-8 



23 



50 22-9 



Oct. 19 



52 



41-2 



52 



35-0 



53 



20-0 



233 



52 



52-1 



43 



25-0 



42 



57-5 



43 



100 



77 43 



10-8 



23 



50 18-7 



Dec. 31 



52 



43-7 



52 



22-5 



52 



52-5 



53 



52 



39-6 



42 



52-5 



43 



13-7 



43 



350 



257 43 



13-7 



23 



50 34-1 



Dec. 31 



52 



17-5 



52 



20-0 



53 



50 



233 



52 



34-2 



43 



12-5 



42 



47-5 



43 



3-7 



77 43 



1-2 



23 



50 27-0 



1845. 









































Jau. 17 



52 



137 



52 



18-8 



52 



55-0 



233 



52 



29-2 



42 



52-5 



42 



350 



42 



52-5 



77 42 



46-7 



23 



50 17-5 



Jan. 17 



52 



15-0 



52 



18-7 



52 



59-0 



233 



52 



30-9 



42 



58-1 



42 



350 



42 



53-7 



77 42 



48-9 



23 



50 18-0 



Jan. 17 



52 



42-5 



52 



20-0 



52 



57-5 



53 



52 



40-0 



42 



55-0 



43 



17-5 



43 



37-5 



257 43 



16-7 



23 



50 36-7 



Jan. 1 7 



52 



8-7 



52 



10-0 



52 



52-5 



233 



52 



23-4 



43 



0-0 



42 



40-0 



42 



57-5 



77 42 



52-5 



23 



50 29-1 



Jan. 17 



52 



25-0 



52 



2-5 



52 



37-5 



233 



52 



21-7 



42 



25-0 



42 



42-5 



43 



2-5 



77 42 



43-3 



23 



50 21-6 



Jan. 17 



52 



23-7 



52 



2-5 



52 



43-1 



53 



52 



231 



42 



38-7 



42 



55-0 



43 



15-5 



257 42 



56-4 



23 



50 33-3 



May 8 



52 



7-5 



52 



5-0 



52 



57-5 



233 



52 



23-3 



43 



7-5 



"42 



42-5 



43 



100 



77 43 



00 



23 



50 36-7 



1846. 









































Apr. 13 



48 



5-0 



47 



43-7 



47 



32-5 



53 



47 



47-1 



37 



57-5 



38 



200 



38 



2-5 



257 38 



6-7 



23 



50 19-6 



Apr. 13 



47 



28-7 



47 



8-8 



47 



32-5 



233 



47 



23-3 



38 



12-5 



37 



40-0 



37 



250 



77 37 



35-8 



23 



50 12-5 



May 7 



48 



5-0 



47 



33-7 



47 



27-5 



53 



47 



42-1 



38 



2-5 



38 



22-5 



38 



5-0 



257 38 



10-0 



23 



50 27-9 



May 9 



: 47 



53-7 



47 



41-2 



48 



50 



233 



47 



53-3 



38 



43-7 



38 



5-0 



37 



45-0 



77 38 



11-2 



23 



50 17-9 



May 9 



1 48 



17-5 



47 



200 



47 



20-0 



53 



47 



39-2 



37 



55-0 



38 



10-0 



37 



57-5 



257 38 



0-8 



23 



50 21-6 



17. The mean value of angle A from all the observations 



in 1844, 1845, and 1846, .... 

 The mean value of angle A from all the observations 



in 1844, 



The value of angle Z (Table 8, Introduction, 1841-2), 

 Whence angle A + Z, 



The absolute westerly declination, therefore, corresponding to the zeros of the 

 scales, No. 8, =25° 28'-04. This value has also been employed for the observa- 

 tions in 1845 and 1846. For other scale readings differing from the zero by the 

 angular quantity ± D, the declination is obtained from the formula, declination 

 = 25° 28'-04 ± D. 



=23° 



50' 



24"-5 



=23° 



50' 



23"-9 



= 1° 



37' 



38"-8 



=25° 



28' 



2"-7 



