The Rutherfurd Photographic Measures. 



141 



Table XVIII. — Parallax Equations. 

 Position-Angle. Star 43. 

















Residuals 

















in arc of 



Plate. 



Reduced Angle 













jreat circle. 



1 



i43° 5 o' 1" 



i.ocu/ 



— i.i4.V / 



+101. n 



— 48."= 



—".OI 



2 



4942 



1. 00 



— 1.13 



+104. 



-67. 



= 



— -17 



3 



5022 



1. 00 



— 1.13 



+104. 



—27. 



= 



+ .18 



10 



5028 



1. 00 



+0.89 



+108. 



— 21. 



= 



+ -07 



ir 



5019 



1. 00 



+0.90 



+109. 



— 3°- 



= 



— .01 



12 



50 16 



1. 00 



+0.90 



+109. 



—33- 



= 



— -03 



13 



5017 



1. 00 



+0.90 



+109. 



—32. 



= 



— .02 



15 



52 5 



1.00 



+ 1.42 



—114. 



+76. 



= 



+ -23 



16 



5i 23 



1. 00 



+I-45 



—113- 



+34- 



= 



— -14 



18 



. 51 43 



1. 00 



+I-45 



— 112. 



+54- 



= 



+ -04 



19 



52 19 



1. 00 



+I-45 



— 112. 



+90. 



= 



+ .36 



20 



5041 

 143 50 49.0 = 



1. 00 

 Adopted 



+I-45 

 Mean. 



— 112. 



— 8. 



= 



— -5i 



Normal Equations. 

 +I2.0CW/4- 7.413/'+ 181.00II — 12.00 = 

 +17.50 — 772.69 + 411.17 = 

 +142537.00 —54985.00 = 



Solution, 

 n = +0^.3299 ±o".o658 [«»] = 6788. 

 y / = — 9 .8126 ±6 .845 a = i824 // .90 



x / = +2 .0830^7 .280 Factor = .00885 



In Angle. Arc of great circle. 

 Probable error of one equation = ±18". 52 = ±o".i638 



