234 Permanence of the Rutherfurcl Photographic Plates. 



Results of the Measures, Plate 22, Y-coordinate (Rev'd). — 



( Continued.) 



Desig. 



of 

 Star. 



Microm. Readings. 



Difif. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 

 Star. 



On Scale. 



Line 



Reading. 



A28, E 

 W 



78 E 

 W 



A30,E 

 W 



79 E 

 W 



A39,E 

 W 



80 E 

 W 



9- 5440 

 9.0190 

 9-5075 

 8-9955 



9-5335 

 9.0405 

 9-5025 

 90015 



9-5545 

 9.0425 



9-5055 

 9.0110 



17 

 17 

 17 

 17 



49 

 49 

 49 

 49 



90 

 90 

 90 

 90 



9-9930 

 9-4695 

 9.9615 

 9.4490 



9-7430 

 9.2430 

 9.7130 

 9-2085 



11.1710 

 10.6260 

 1 1. 1265 

 10.6000 



0.4490 

 0.4505 

 0.4540 

 0.4535 



0.2095 

 0.2025 

 0.2105 

 0. 2070 



I.6165 



1.5835 

 I. 6210 

 1.5890 



0.2249 

 0.2269 



0. 1030 

 0.1044 



0.8000 

 0.8025 



— 0.0006 

 —0.0006 



+0.0027 

 -I-O.0027 



-|- 0.0008 

 +0.0008 



17.2243 

 17.2263 



49.1057 

 49.1071 



90.8008 

 90.8033 



D. 



J. 



D. 

 J. 



D. 



J. 



