254 Permanence of the Rxdherfurd Photographic Plates. 



Results of the Measures, Plate 16, Y-coordinate (Kev'd). 

 ( Continued). 



Desig. 



of 

 Star. 



Microm. Readings. 



Diflf. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 



Star. 



On Scale. 



Line 



13 

 13 

 13 

 13 



45 

 45 

 45 

 45 



87 

 87 

 87 

 87 



Reading. 



A28,E 

 W 



166 E 

 W 



A30, E 

 W 



167 E 

 W 



A39,E 

 W 



168 E 

 W 



9-5265 

 9.0190 

 9-5190 

 9.0360 



9-5235 

 9-0235 

 9-5475 

 9-0590 



95300 

 9.0330 

 9-5170 

 9.0085 



11.4460 

 10.9490 



11-4395 

 10.9695 



II. 2410 

 10.7580 

 11.2600 

 10.7900 



10.6725 

 10.1875 

 10.6610 

 10.1625 



1-9195 

 I.93CO 

 1.9205 

 1-9335 



1-7175 

 1-7345 

 1-7125 

 1.7310 



1-1425 

 I- 1545 

 1. 1440 



1. 1540 



0.9624 

 0.9635 



0.8630 

 0.8609 



0.5742 

 0.5745 



— .0016 

 — .0016 



— .0004 

 — .0004 



+.0024 

 -[-.0024 



13.9608 

 13.9619 



45.8626 

 45-8605 



87-5766 

 87-5769 



D. 

 D. 



D. 

 D. 



D. 

 D. 



