The Rutherfurd Photographic Measures. 147 





Table 



XX. — Parallax 



Equations 



in Angle. 













Comparison Star, 61 x 



Cyg 



ni. 







Plate. 

















1 



',\ 



I 



i. oar' 



f 



—1.69/ 



+c 



»-597n 



— " . 100=0 



+".005 



2 



I.OO 





—1.68 



+ 



•633 



— 



.074= 



+ 



•033 



3 



I.OO 





—1.68 



+ 



•633 



— 



.142=0 



4- 



.065 



4 



I.OO 





-0.63 



+ 



.802 



— 



.165=0 



— 



.103 



5 



I.OO 





— 0.59 



+ 



.890 



— 



.058=0 



4- 



.006 



6 



I.OO 





—0.59 



+ 



.890 



+ 



.122=0 



4- 



.186 



7 



I.OO 





-0.58 



+ 



.896 



— 



.150=0 



— 



.086 



8 



I.OO 





+0.33 



+ 



.672 



— 



.134=0 



— 



.128 



9 



I.OO 





+0.33 



+ 



.672 



+ 



.025=0 



4- 



.031 



IO 



I.OO 





+0.34 



+ 



•723 



+ 



.087=0 



+ 



.095 



ii 



I.OO 





+0.35 



+ 



.742 



+ 



.063=0 



4- 



.072 



12 



I.OO 





+0.35 



+ 



•742 



+ 



.013=0 



+ 



.022 



13 



I.OO 





+0.35 



+ 



.742 



— 



.113=0 



— 



.104 



15 



I.OO 





+0.87 



— 



.850 



+ 



.068=0 



— 



.031 



16 



I.OO 





+0.90 



— 



.910 



+ 



.012=0 



— 



.092 



17 



I.OO 





+0.90 



— 



.910 



+ 



•383=0 



4- 



.279 



18 



I.OO 





+0.91 



— 



•913 



— 



.076=0 



— 



.181 



19 



I.OO 





+0.91 



— 



•913 



+ 



.037=0 



— 



.068 



20 



I.OO 





+0.91 



— 



•9*3 



+ 



.205=0 



+ 



.100 









Normal Equations. 













+19. 



ooooooj;+ o.oioooo?/-|- 4.225 000II +o // . 003 000 = c 



» 











+15-49 



25OO — 



8.612 500 



4-: 



[ .231450 = 













4- 



12.145003 



— 1 



: .012807=0 



• 













Solution. 

























Weights. 









x' = 



— o".oii5 ±" 



.0200 







16.57 









y' = 



— 



.0510 ± 



.0273=- 



— O°.I5I±:O .o8l 8.87 









n = 



+0 



.0512 zb 



.0321 







6.42 







