242 Permanence of the Ratherfurd Photographic Plates. 



Results of the Measures, Plate 24, X-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 



81 

 80 

 81 

 80 



94 

 93 

 94 

 93 



113 

 112 



113 

 112 



Reading. 



A28,E 

 W 



113 E 

 W 



A30,E 

 W 



114 E 



W 



A39,E 

 W 



115 E 



W 



9-5195 

 9.0370 



9-4965 

 9.01 10 



9.5270 

 9.0500 



9.4870 

 8.9990 



9-5310 

 9.0190 

 9-5085 

 8.9990 



II.5170 

 10.1355 

 11.5020 

 10. 1 190 



11.2380 

 9-8590 



11.2005 

 9-8215 



11.0660 

 9-6685 



11.0600 

 9-6605 



1-9975 

 1.0985 

 2.0055 

 1. 1080 



1.7110 

 0.8090 



I-7135 

 0.8225 



1-5350 

 0.6495 



I -55 15 

 0.6615 



0.7740 

 0.7784 



0.6300 

 0.6340 



0.5461 

 0.5532 



+.0019 

 + .0019 



-f.0003 

 +.0003 



—.0015 

 — .0015 



81.2751 

 81.2803 



94-1303 

 94-1343 



113.0446 

 I13.0517 



D. 



J. 



D. 

 J. 



D. 

 J. 



