236 Fer^manence of the Rutherfurd Photographic Plates. 

 Results of the Measures, Plate 22, Standards {Continued). 



X-COORDINATE 



Circle right i8i 27 49, 27 49. 

 Circle left. 27 51, 27 50. 



Desig. 



of 



Star. 



Microm. Readings. 



DiflF. 



Mean 

 2 



Screw 



and Div. 



Error. 



Pinal 

 Reading. 



Obs'r. 



On 



Star. 



On Scale. 



Line 



Reading. 



A34,E 

 W 



85 E 

 W 



18 m, E 

 W 



86 E 



w 



9.0320 

 9-5165 

 9-5320 

 9.0140 



9-5445 

 9.0120 

 9-5310 

 9.0165 



31 

 33 

 31 

 33 



103 

 105 

 103 

 105 



10.6635 

 10.9475 



11.1645 

 10.4380 



10.6930 

 9.9285 



10.6880 

 9-9345 



1.6315 

 1.4310 

 1.6325 

 1.4240 



1. 1485 

 0.9165 

 1. 1570 

 0.9180 



0.7656 

 0.7641 



0.5162 

 0.5188 



+.0004 

 4-.0004 



+.0001 

 -f .0001 



32.7660 

 32.7645 



104.5163 

 104.5189 



D. 

 D. 



Y-COORDINATE. 



Circle right 91 27 50, 27 50. 

 Circle left 27 48, 27 48. 



Desig. 



of 

 Star. 



Microm. Readings. 



Diff. 



Mean 

 2 



Screw 

 and Div. 

 Error. 



Pinal 

 Reading. 



Obs'r. 



On 



Star. 



On Scale. 



Line 



Reading. 



A34,E 

 W 



87 E 

 W 



i8m, E 

 W 



88 E 

 W 



9-4685 

 9.0140 



9-4845 

 9-OI45 



9-5195 

 9.0150 

 9.4805 

 9-0015 



93 

 93 

 93 

 93 



17 

 17 

 17 

 17 



9.5240 

 9.0820 



9-5445 

 9.0805 



10.0600 

 9-5360 



10.0245 

 9-5150 



0.0555 

 0.0680 

 0.0600 

 0.0660 



0.5405 

 0.5210 



0.5440 

 0.5135 



0.0309 

 0.0315 



0.2654 

 0.2644 



+0.0019 

 -)-o.ooi9 



— 0.0007 

 — 0.0007 



93.0328 

 93-0334 



17.2647 

 17.2637 



J. 



J. 



J. 

 J. 



