252 Permanence of the Rutherfurd Photographic Plates. 



Results op the Measures, Plate 16, X-coordinate (Rev'd). 

 {Continued). 



Desig. 



of 

 Star. 



Microm. Readings. 



Diff. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 



Star. 



On Scale. 



Line 



Reading. 



A28,E 

 W 



\m E 



w 



A3o,E 

 W 



158 E 

 W 



A39,E 

 W 



159 E 

 W 



9.5420 

 9.0260 



9-5075 

 9.0120 



9.5300 

 9.0220 

 9-5225 

 9.0205 



9-5190 

 9.0290 

 9-5150 

 9.0200 



80 



79 

 80 



79 



93 

 92 



93 

 92 



112 

 III 

 112 

 III 



10.7490 

 10.7770 

 10.7085 

 10.7680 



10.3625 

 10.4105 

 10.3615 

 10.4015 



10.0400 

 10. 1 1 20 

 10.0440 

 10.1035 



1.2070 

 1. 7510 



1.20I0 

 1.7560 



0.8325 

 1.3885 

 0.8390 

 1,3810 



0.5210 

 1.0830 

 0.5290 

 1.0835 



0.7395 

 0.7392 



0.5552 

 0.5550 



0.4010 

 0.4031 



+.0019 

 + .0019 



+.0004 

 +.0004 



— .0012 

 — .0012 



80.2414 

 80.2411 



93-0556 

 93-0554 



III. 8998 

 III. 9019 



D. 

 D. 



D. 

 D. 



D. 



D. 



