248 Permanence of the Rutherfurd Photographic Plates. 



Results of the Measures, Plate 16, X-coordinate {Continued^. 



Desig. 



of 

 Star. 



Microm. Readings. 



Diff. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 



Star. 



On Scale. 



Line 



49 

 50 

 49 

 50 



36 



37 

 36 



37 



18 

 18 

 18 

 18 



Reading. 



A28, E 

 W 



139 E 

 W 



A30,E 

 W 



140 E 



W 



A39,E 

 W 



141 E 



W 



9.0290 

 9-5205 

 9.0030 

 9-5065 



9- 0455 

 9-5340 

 9-0175 

 9.4900 



9-0195 

 9-5090 

 9.0090 

 9-4885 



10.5560 

 10.5080 



10.5345 

 10.5040 



10.9600 

 10.8820 

 10.9320 

 10.8500 



9.2245 

 1 1. 1590 



9-2340 

 II. 1525 



1.5270 

 0.9875 

 I-5315 

 0.9975 



I.9145 

 1.3480 



I-9145 

 1.3600 



0.2050 

 1.6500 

 0.2250 

 1.6640 



0.6286 

 0.6322 



0.8156 

 0.8186 



0.4638 

 0.4722 



+.0012 

 +.0012 



+.0007 

 +.0007 



—.0013 

 —.0013 



50.1298 

 50.1334 



37-3163 

 37-3193 



18.4625 

 18.4709 



D. 



J. 



D. 



J. 



D. 



J. 



