Permanence of the Butherfurd Photographic Plates. 251 



Results of the Measures, Plate 16, X-coordinate (Rev'd). 

 Date of Measures, 1895, Dec. 30. 



o / // / // 



Temperature, 64.5, 67.2. Circle right 2 26 20, 26 21. 



Runs, +.0200, +.0210. Circle left 26 20, 26 22. 



Desig. 

 of 



Microm. Readings. 



Diflf. 



Mean 



Screw 

 and Div. 



Final 



Obs'r. 





On Scale. 



Star. 



On 

 Star. 







2 



Error. 



Reading. 













Line 



Reading. 













A34,E 



9-5160 



lOI 



11.0500 



1-5340 



0.4031 



— .0002 



101.4029 



D. 



W 



9.0245 



lOI 



9- 1030 



0.0785 











E 



9-5300 



lOI 



II. 0610 



I-53IO 



0.4021 



— .0002 



IOI.4019 



D. 



W 



9.0225 



lOI 



9.1000 



0.0775 











151 E 



9-5415 



lor 



11.0775 



1-5360 



0.4048 



— .0002 



101.4046 



D. 



W 



9.0030 



lOI 



9.0860 



0.0830 











E 



9-5390 



lOI 



11.0700 



I-5310 



0.4029 



— .0002 



101.4027 



D. 



W 



9.0100 



lOI 



9.0905 



0.0805 











i8m, E 



9-5285 



29 



11-3735 



1.8450 



0.5610 



+.0004 



29.5614 



D. 



W 



9.0095 



29 



9.4085 



0.3990 











E 



9.5220 



29 



11.3645 



1.8425 



0.5605 



+.0004 



29.5609 



D. 



W 



9.0225 



29 



9.4220 



0-3995 











152 E 



9-5385 



29 



11.3825 



1.8440 



0.5605 



+.0004 



29.5609 



D. 



W 



9.0190 



29 



9.4170 



0. 3980 











E 



9-5445 



29 



11-3855 



1.8410 



0.5602 



+.0004 



29.5606 



D. 



W 



9.0080 



29 



9.4080 



0.4000 











24P, E 



9-5140 



64 



10.2890 



0.7750 



0.5252 



+-0039 



64.0291 



D. 



W 



9.0160 



63 



10.3420 



1.3260 











E 



9-5190 



64 



10.2900 



0.7710 



0.5246 



+-0039 



64.0285 



D. 



W 



9.02 J 5 



63 



10.3490 



1-3275 











153 E 



9-5325 



64 



10.3085 



0. 7760 



0.5254 



+-0039 



64.0293 



D. 



W 



9.0260 



63 



10.3515 



1-3255 











E 



9.5080 



64 



10.2800 



0.7720 



0.5254 



+.0039 



64.0293 



D. 



W 



9.0110 



63 



10.3405 



1-3295 











A12, E 



9.5100 



58 



10.3395 



0.8295 



0-5556 



+.0034 



58.0590 



D. 



W 



9.9080 



57 



10.4010 



1.3930 











154 E 



9.5200 



58 



10.3485 



0.8285 



0.5560 



+-0034 



58.0594 



D. 



W 



9.0260 



57 



10.4215 



1-3955 











A22, E 



9.5460 



65 



10.4450 



0.8990 



0.5916 



+ .0028 



65.0944 



D. 



W 



9.0245 



64 



10.4920 



1-4675 











155 E 



9-5380 



65 



10.4355 



0.8975 



05892 



+.0028 



65.0920 



D. 



W 



9.0485 



64 



10.5080 



1-4595 











A24,E 



9.5120 



66 



10.3005 



0.7885 



0-5352 



+-0034 



66.0386 



D. 



W 



9.0100 



65 



10.3625 



1-3525 











156 E 



9-5330 



66 



10.3275 



0-7945 



0-5385 



+-0034 



66.0419 



D. 



W 



9.0330 



65 



10.3925 



1-3595 











