228 Permanence of the Rutherfurd Photographic Plates. 

 Results of the Measures, Plate 22, X-coordinate {Continued). 



Desig. 



of 



Star. 



Microm. Readings. 



Difi. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 

 Star. 



On Scale. 



Line 



53 

 54 

 53 

 54 



40 

 42 

 40 

 42 



21 



23 

 21 



23 



Reading. 



A28, E 

 W 



51 E 

 W 



A30,E 

 W 



52 E 

 W 



A39,E 

 W 



53 E 

 W 



9.0300 

 9.4980 

 8.9895 

 9.4905 



9.0560 

 9.4965 

 9.0075 

 9.5045 



9.0385 

 9.5070 

 8.9840 

 9-5100 



9.0445 



11-3275 



9.0120 



11-3345 



9.3950 

 9.6120 

 9.3525 

 9-6235 



9.6080 

 9.8450 



9-5535 

 9.8625 



0.0145 

 1.8295 

 0.0225 

 1.8440 



0.3390 

 O.I 155 

 0.3450 

 0.I190 



0.5695 

 0.3380 

 0.5695 

 0.3525 



0.4610 

 0.4666 



0.1 136 

 0.1 160 



0.2269 

 0.2305 



+0.0017 

 +0.0017 



+0.0012 

 +0.0012 



—0.0002 

 — 0.000 1 



53.9627 

 53.9683 



41.II48 

 41.II72 



22.2267 

 22.2304 



D. 



J. 



D. 



J. 



D. 



J. 



