The Bather -furd Photographic Measures. 137 



Table XYII. — Parallax Equations. 

 Comparison Stars 48 and 14. 













Residuals. 



late. 











Scale. 



Arc. 



2 



I. OOP 



—1-132/ 



— I.55H 



+1.87=0 



+0.32 



4-o // .09 



3 



1. 00 



— 1.13 



—1-55 



4-1.19 = 



-0.36 



— .10 



IO 



1. 00 



+0.89 



— 1.42 



4-1.67 = 



+O.23 



4- .06 



II 



1. 00 



+0.90 



-1.38 



4-o.68 = o 



—O.71 



— .20 



12 



1. 00 



+0.90 



-1.38 



+0.81=0 



-0.58 



— .16 



13 



1. 00 



+0.90 



-1.38 



4-2.62 = 



+ 1-23 



4- -34 



15 



1. 00 



+1.42 



+1.19 



—1.32 = 



+0.84 



4- .24 



16 



1. 00 



+ I-45 



+C-93 



—0.78 = 



4-I-02 



4- -29 



18 



1. 00 



+1-45 



+0.90 



—3-i3 = o 



—1-37 



- -38 



19 



1. 00 



+I-45 



+0.90 



— 2.81=0 



—1.05 



— -30 



20 



1. 00 



+ I-45 



4-0.90 



—1.30 = 



4-0.46 



+ -13 











[to] =7.58 





Normal Equations. 

 4"ii.oooox4- 8.55003/ — 3.8400II — 0.5000 = 



4-16.2023 4- 5.4665 —11.7759 = 

 4-17.2456 —21.5984=0 



Solution. 



In units of 2d dec. place of scale. In Arc. 



n = 4-1.3880 ±0.2261 n = 4-o // .388S ±o".o634 

 y — — 0.0359 ±0.2918 y = — o .0101 ±0 .0818 



x = 4-0.5579 ±0.3485 x = 4-o .1563 ±0 .0976 



Scale. Arc. 



Probable error of one equation ±0.6568 = ±o // . 1840 



