224 Permanence of the Rutherfurd Photographic Plates. 



Results op the Measures, Plate 18, X-coordinate (Rev'd). 



{Continued.) 



Desig. 



of 



Star. 



Mierom^ Readings. 



Difif. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 

 Star. 



On Scale. 



Line 



Reading. 



A28,E 

 W 



33 E 

 W 



A3o,E 

 W 



34 E 

 W 



A39.E 



w 



35 E 



W 



9.4960 

 9. Olio 

 9.5040 

 8.9990 



9-5190 

 9.0400 



9-4925 

 8.9965 



9-5395 

 9.0170 

 9.5120 

 9.0075 



80 



79 

 80 



79 



93 

 92 



93 

 92 



112 

 III 

 112 

 III 



10.5165 

 9.8310 



10.5385 

 9.8200 



10.2655 



9-5945 



10.2485 



9-5605 



10.1220 



9-4295 



10.1075 



9.4280 



1.0205 

 0.8200 



1-0345 

 0.8210 



0.7465 

 0.5545 

 0.7560 

 0.5640 



0.5825 

 0.4125 



0.5955 

 0.4205 



0.4601 

 0.4639 



0.3252 

 0.3300 



0.2488 

 0.2540 



+0.0028 

 +0.0028 



+0.0010 



+O.OOII 



— 0.0007 

 — 0.0007 



79.9629 

 79.9667 



92.8262 

 92.8311 



III. 7481 

 III-7533 



D. 

 J. 



D. 

 J. 



D. 

 J. 



