246 Permanence of the Rutherfurd Photographic Plates. 

 Results of the Measures, Plate 24, Standards {Continued). 



X-COORDINATE. 



O / II I It 



Circle right 182 20 31, 20 32. 

 Circle left 20 29, 20 24. 



Desig. 



of 

 Star. 



Microm. Readings. 



Diff. 



Mean 



2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 



Star. 



On Scale. 



Line 



Reading. 



A34,E 

 W 



129 E 

 W 



i8m, E 

 W 



130 E 

 W 



9.5170 

 9.0200 

 9.5125 

 9.0195 



9.5205 

 9.0030 

 9.5205 

 9.0060 



27 

 28 



27 

 28 



98 

 100 



98 

 100 



9.8625 

 10.2615 



9.8615 

 10.2720 



11.3490 

 9.6755 



11.3500 

 9.6845 



0.3455 

 I.2415 

 0.3490 

 1.2525 



1.8285 

 0.6725 

 1.8295 

 0.6785 



0.3968 

 0.4004 



0.6252 

 0.6270 



+.0018 

 +.0018 



-(-.0002 

 +.0002 



27.8986 

 27.9022 



99.6254 

 99.6272 



D. 

 D. 



D. 

 D. 



Y-(J0ORDINATE. 



o y III II 



Circle right 92 20 31, 20 32. 

 Circle left 20 30, 20 30. 



Desig. 



of 



Star. 



Microm. Readings. 



Diff. 



Mean 

 2 



Screw 



and Div. 



Error. 



Final 

 Reading. 



Obs'r. 



On 



Star. 



On Scale. 



Line 



Reading. 



A34,E 

 W 



131 E 

 W 



18 m, E 

 W 



132 E 

 W 



9.4835 

 8.9800 



9.4705 

 8.9830 



9.4775 

 9.0120 



9-5115 

 9-0145 



93 

 93 

 93 

 93 



18 

 18 

 18 

 18 



11.4685 

 10.8755 



11.4415 

 10.8790 



9-8795 

 9-3315 

 9.9065 



9-3285 



1.9850 



1.8955 

 I.9710 

 1.8960 



0.4020 

 0.3195 

 0.3950 

 0.3140 



0.9701 

 0.9668 



0. 1804 

 0.1772 



— .0008 

 — .0008 



—.0005 

 —.0005 



93.9693 

 93.9660 



18.1799 

 18.1767 



J. 

 J. 



J. 

 J. 



