250 Permanence of the Rutherfurd Photographic Plates. 



Results of the Measures, Plate 16, Y-coordinate (^Continued). 



Desig. 

 of 



Star. 



Microm. Readings. 



Difi. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 

 Star. 



On Scale. 



Line 



116 

 116 

 116 

 116 



84 

 84 

 84 

 84 



42 

 42 

 42 

 42 



Reading. 



A28, E 

 W 



148 E 

 W 



A30, E 

 W 



149 E 

 W 



A39,E 

 W 



150 E 

 W 



9.0200 



9-5175 

 9.0010 



9-4815 



9-0285 

 9.5280 

 8-9935 

 9-4895 



9.0420 

 9.5200 

 8.9830 

 9-5045 



9-8330 

 10.3195 



9-8325 

 10.3085 



10.0495 

 10.5380 

 10.0305 

 10.5025 



10.6310 



II-II35 

 10.5880 

 1 1. 1080 



0.8130 

 0.8020 

 0.8315 

 0.8270 



1. 0210 

 I.oroo 

 1.0370 

 1. 0130 



1.5890 



1-5935 

 1.6050 

 1-6035 



0.4038 

 0.4146 



0.5078 

 0.5125 



0.7956 

 0.8021 



— .0002 

 — .0009 



+.0015 

 +.0016 



— .0013 

 —.0013 



116.4036 

 I16.4137 



84-5093 

 84.5141 



42.7943 

 42.8008 



D. 



J. 



D. 

 J. 



D. 



J. 



