340 Rutherfurd Photographic Measures. 



Table III. — Corrections for Precession, etc., to 1875.0. 



Plate 



Position Angle 



Distance 





Correction. 



Factor X i° 3 - 



I 



+ « 



— .0048 



2 



4- 4-3 



— .0048 



3 



4- 4-3 



— .0048 



4 



+14.0 



—0554 



5 



4-14.0 



—•0554 



6 



+14.0 



—•0554 



Table IV. — Zero Corrections. 



Plate. 



Zero Correction. 



Special 

 Corr'n, West. 



Adopted 

 Mean. j 



East. 



West. 



I 



2 



3 



4 

 5 

 6 



+8> 45" 

 +8 48 

 +8 47 

 +9 

 +9 7 

 +9 12 



+8' 45" 

 +8 48 

 +8 48 

 +9 

 +9 8 

 +9 H 



—30" 



—28 



—27 



—32 



—32 



—31 



+8' 30" 

 4-8 34 | 

 +8 34 

 4-8 44 

 +8 52 

 4-8 58 | 



Table IV. A. — Tangent Correction. 



Distance. Coi 



'rection. 



div. 



div. 



20 — 



OOOO 



25 



OOO I 



30 



0002 



35 



0003 



40 



0004 



45 



0006 



5o 



0008 i 



55 



0010 



60 



0013 



65 



0017 



70 



002 1 



75 



0026 



80 



0032 



85 



0038 



90 



0045 



95 



0053 



100 



0062 



105 



0071 



no 



0081 



"5 



0093 



120 



0106 



