Permanence of the Rutherfurd Photographic Plates. 235 



Results op the Measures, Plate 22, Standards. 

 Date of Measures, 1895. Dec. 12. Y-coordinate (Rev'd). 



O I II I II 



Temperature, 61.8, 58.8. Circle right 271 27 49, 27 47. 



Runs, +.0200, +.0180. Circle left 27 47, 27 47. 



Desig. 



of 

 Star. 



Microm. Readings. 



DiflE. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 

 Star. 



on Scale. 



Line 



37 

 37 

 37 

 37 



113 

 113 

 113 

 113 



Reading. 



A34,E 

 W 



81 E 

 W 



i8m, E 

 W 



82 E 

 W 



9.0295 

 9-5195 

 9-0655 

 9-5490 



9.0450 

 9-5265 

 9-0055 

 9-5055 



9-7105 

 10. 1865 



9.7380 

 10.2180 



9-2565 

 9.7560 

 9.2160 

 9-7375 



0.6810 

 0.6670 

 0.6725 

 G.6690 



0.2115 

 0.2295 

 0.2105 

 0.2320 



0.3370 

 0.3354 



O.I 102 

 0. 1 106 



+.0020 

 +.0021 



—.0003 

 —.0003 



37-3390 



37-3375 



113. 1099 

 I 13. I 103 



D. 

 D. 



D. 

 D. 



X-cooRDiNATE (Rev'd). 

 Circle right i 27 54, 27 50. 

 Circle left 27 50, 27 52. 



Desig. 



of 

 Star. 



Microm. Readings. 



Diff. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 



Star. 



On Scale. 



Line 



Reading. 



A34,E 

 W 



83 E 

 W 



i8m, E 

 W 



84 E 

 W 



8.9960 



9-4955 

 9.0010 

 9.4825 



8.9765 

 9.4980 

 9.0025 

 9-5090 



98 

 96 

 98 

 96 



26 



24 

 26 

 24 



10.1045 

 10.8160 

 10. I 105 

 10.8020 



10.5480 

 II. 3180 



10.5715 

 11.3260 



1. 1085 

 1-3205 

 1. 1095 

 1-3195 



1-57^5 

 1.8200 

 1.5690 

 1. 8170 



0.6072 

 0.6072 



0.8479 

 0.8465 



+.0004 

 +.0004 



— .0008 

 — .0008 



97.6076 

 97.6076 



25.8471 

 25-8457 



J. 

 J. 



J. 

 J. 



