1903.) - DOOLITTLE—ORBIT OF DOUBLE STAR 2 518. Lis 
THE COMPUTATION, 
There are available for this determination measures on 141 
nights, as shown in the following table. In the first column will 
be found the date of observation; in the second, the measured 
distance; in the third, the measured angle; in the fourth, the 
number of nights on which the measures were made, and in the 
fifth, the name of the observer. 
Date. | p. 6. aoe Observer. 
di 41 ° 
I 1783.13 4to8 326.7 I Herschel. 
2 1825.12 287 + I Struve. 
3 1835 to 36 WW ~ 
4 1850.94 3.96 156.60 2 Otto Struve. 
5 1851.06 32 159.96 I Dawes. 
6 1851.49 3.87 155.10 2 Otto Struve. 
7 1853.64 3-93 158.30 3 e 
8 1854.79 4.13 155.30 I “ 
9 1856.80 4.51 152.90 I ‘“ 
10 1857.82 4.40 153.00 I “ 
II 1864.84 4.45 147.60 2 Winnecke. 
12 1865.89 4.26 143.95 2 Ot'o Struve. 
13 1869.10 4.46 140,40 I Ss 
14 1871.99 2+ 1254 I Knott. 
15 1872.56 4.62 140,65 I-2 |* Otto Struve. 
16 1873.99 4.27 133.90 I ss 
17 1874.10 4.39 135.70 I «6 
18 1875.14 3.80 138.10 I + 
19 1876.11 4.01 130.50 ro & 
20 1877.12 2+ 120, I Flammarion. 
21 1877.84 3.36 127.50 3 Cincinnati. 
22 1877.84 3.92 128,24 6 Burnham. 
23 1877.95 3.94 126.45 4 Dembowski. 
24 1878.14 4.36 125.50 I Otto Struve. 
25 1879.05 3.49 125.38 4 Burnham, 
26 1879.18 3.52 125.00 2. | Hall. 
27 1879.75 3.29 120.00 1 | Cincinnati. 
28 1880.09 3.28 121.30 5 Burnham, 
29 1880.95 3.16 122.06 5 4 
30 18381,84 3.53 119,00 Gn 8 ce 
31 1882.12 2.25 {18.15 2 |) Hall, 
32 1883.00 3.07 119.20 2 Burnham. 
33 1883.81 3.10 115.80 2 Hall. 
34 1884.16 3.74 118,20 I Herman Struve, 
35 1886.00 2522 DI2.15 2 Leavenworth, 
