Permanence of the Butherfurd Photographic Plates. 241 

 Results op the Measures, Plate 24, X-co6rdinate (Rev'd). 



Date of Measures, 1895, Dee. 16. 

 Temperature, 58.5, 64.0. 

 Runs, +.0180, +.0210. 



Circle right 2 20 30, 20 30. 

 Circle left 20 28, 20 32. 



Desig. 

 of 



Microm. Readings. 



Diff. 



Mean 



Screw 

 and Div. 



Final 



Obs'r 





On Scale. 



Star. 



On 



Star. 







2 



Error. 



Reading. 





Line 

 103 



Reading. 



A34, E 



9-5185 



9.9000 



0.3815 



0.4660 



—.0003 



102.4657 



D. 



W 



9.0220 



lOI 



10.5045 



1.4825 











E 



9-5285 



103 



9-9155 



0.3870 



0.4704 



—.0003 



102.4701 



D. 



W 



9.0205 



lOI 



10.5150 



1-4945 











107 E 



9.4830 



103 



9.8780 



0.3950 



0.4618 



— .0002 



102.4616 



J. 



W 



8.9785 



lOI 



10.4305 



1.4520 











E 



9-5185 



103 



9.9080 



0.3895 



0.4719 



—.0003 



102.4716 



J. 



W 



9-0345 



lOI 



10.5325 



1.4980 











i8m,E 



9-5275 



31 



10.4370 



0.9095 



0.2374 



+.0024 



30.7398 



D. 



W 



9.0300 



30 



9.0700 



0.0400 











E 



9-5300 



31 



10.4300 



0.9000 



0.2345 



+.0024 



30.7369 



D. 



W 



9.0540 



30 



9.0920 



0.0380 











108 E 



9.5020 



31 



10.4285 



0.9265 



0.2468 



+.0024 



30.7492 



J. 



W 



9.OIIO 



30 



9-0715 



0.0605 











E 



9-4905 



31 



10.4055 



0.9150 



0.2412 



+.0024 



30.7436 



J. 



W 



9.0000 



30 



9.0500 



0.0500 











24JJ, E 



9-4965 



65 



11.2065 



1. 7100 



0.6350 



+.0028 



65.1378 



J. 



W 



8.9805 



64 



9.8105 



0.8300 











E 



9-5050 



65 



II. 2120 



1.7070 



0.6346 



+.0028 



65.1374 



J. 



W 



8.9890 



64 



9.8205 



0.8315 











109 E 



9-5175 



65 



11.2205 



1.7030 



0.6324 



+.0028 



65.1352 



D. 



W 



9-0035 



64 



9.8300 



0.8265 











E 



9-5193 



65 



II. 2180 



1.6990 



0.6304 



+.0028 



65.1332 



D. 



W 



9.0190 



64 



9-8415 



0.8225 











A12, E 



9- 4950 



59 



11-3575 



1.8625 



0.7095 



+.0031 



59.2126 



J. 



W 



9.0005 



58 



9.9760 



0.9755 











110 E 



9-5365 



59 



11.3865 



1.8500 



0.7066 



+ .0030 



59.2096 



D. 



W 



9.0300 



58 



10.0065 



0.9765 











A22,E 



9.4665 



66 



11.2780 



1.8115 



0.6846 



+.0031 



66.1877 



J. 



W 



8.9695 



65 



9.8965 



0.9270 











111 E 



9-5130 



66 



11-3045 



1.7915 



0.6736 



+.0031 



66.1767 



D. 



W 



9.0370 



65 



9.9400 



0.9030 











A24,E 



9-5285 



67 



11.2875 



1.7590 



0.6616 



+.0032 



67.1648 



D. 



W 



9.0270 



66 



9-9145 



0.8875 











112 E 



9.4870 



67 



11.2545 



1.7675 



0.6662 



+.0032 



67.1694 



J. 



W 



8.9830 



66 



9.8805 



0.8975 











