ROYAL SOCIETY OF CANADA 
SPECTROGRAPH I 88: 5 T.M. PER MM. 














= | Probable Errors of Single Regions. 
No. Tae 
Plate | of Velocity. | | Errors of Setting. Total | Residual. 
No. | Regions. — | Accidental | 
| Rev. EN | Errors Km. | 
3126 6 OIL EE 0 0000) 0 st 2 2b | ata 49 0.13 
3127 8 7.87 .0009 1.02 1.25 1.86 
3128 9 5.49 .0007 0.78 1237 0.52 
3129 7 6.58 .0016 1.86 1.02 157 
3130 7 5.42 | .0012 1.39 ih sh 0.59 
3146 8 8.54 | 0008 0.90 1067 2753 
3147 a 9 6.42 .0014 1.57 1.89 0.41 
3147 b 9 5.49 .0011 1925 1.39 0°52 
3147 ç 9 5.43 .0008 0.90 1.30 0.58 
3148 a 11 7.56 .0007 0.76 1252 155 
3148 b 11 6.84 .0010 1.08 1221 0.83 
3148 ec 11 6.19 .0006 0.65 1.80 0.18 
3149 a 9 5.49 .0008 0.90 1.83 0.52 
3149 b 9 4.44 .0011 1223 Sail 1.57 
3149 c 9 4.87 .0012 1.34 1.79 TE 
3150 a 9 4.44 .-0007 0.78 1225 197 
3150 b 9 4.44 .0011 1225 1.87 157 
3150 c 9 5.99 .0007 0.78 1.45 0.02 
3238 b 9 3), yl .0008 0.90 1.16 0.50 
3238 ¢ 9 6.20 .0009 1.01 1.61 0.19 
3239 a 9 5.58 .0009 1.01 1.00 0.43 
3239 b 9 5.64 .0008 0.90 1.68 037 
3239 c 9 5.64 .0005 0.56 iL. tks 0.37 
3240 a 9 4.34 .0012 1.34 195 1.67 
3240 b 9 5.08 .0010 i 0.93 0.93 
3240 ce 9 Dro .0012 1.34 1.79 0.50 
3272 a 9 6.21 .0011 1295 0.91 0.20 
3272 b 9 6.98 .0008 0.90 1.64 0.97 
3272 c 9 5.96 .0006 0.67 ur 0.05 
3273 a 9 6.83 0.0011 1:93 1.63 0.82 
3273 b 9 7.76 .0011 1:28 1.39 1972 
3273 ¢ 9 5.22 .0010 1.12 1.80 0.79 
3274 a 9 9,22 .0009 1.01 1.06 0.79 
3274 b 9 6.83 .0008 0.90 1.45 0.82 
3274 ¢ 9 6.15 .0011 1723 0.86 0.14 
3275 a 9 5.90 .0013 1.46 1.36 D2T 
3280 ¢ 9 8.07 0009 1.01 ilecAal 2.06 
3281 ¢ 9 4.23 0005 0.56 0.69 1:78 
*Means.....! 8.84 —6.01 |:4- 0.00097; + 1.09 eek seul 
yoke Probable Error of Setting Single Region‘ = -+1.09 km 
a pes Accidental Error Single Region et 
3 ee ‘Single Plate =+0.47 “ 
Total Probable Error (Accid’1.+System, c) “ i = UNION 
