













Sec. III., 1910. 6. 
[PLASKETT] RADIAL VELOCITY DETERMINATION 81 
SPECTROGRAPH III R. 20.2 T.M. PER MM. 
Probable Errors of Single Regions. 
No. 
Plate of Velocity. Errors of Setting. Total Residual. 
No. Regions. a PA CCLen tal 
Pas kum Errors Km. 
3288 10 =—6.64 |=10 0011 | =0.80 201022 2.09 
3289 9 4.94 .0009 .67 1.04 0.39 
3290 9 5.58 . 0009 .67 0.83 1.03 
3291 10 4.83 .0013 .95 1.18 0.28 
3311 11 3.27 .0011 .78 1.02 1.28 
3312 10 4.16 .0013 95 0.64 0.39 
3313 10 3.47 .0013 .95 1.25 1.08 
3314 10 5.78 .0010 13 0.87 1223 
3315 10 3.33 .0006 .44 ea 1222 
3316 10 4.52 .0008 .58 0.88 0.03 
3317 10 3.04 .0012 .88 0.99 AO 
Means. .... 10 4552210 00105), 3] 0.75 2=11:100 
Average Probable Error of setting Single Region = +0.75 km. 
is ‘Total Accidental Error Single Region == 100) 5° 
à i 4 ““ Single Plate Set) 32.14" 
Total Probable Error (Accid’l. + System, ce) ‘ + eat (ON ae 
