94 NEW DOUBLE STARS AND MEASURES. 
observations which seem to prove that there is orbital motion, 
ue to inde- 
enki 
observations accumulated, the ellipse had gradually to be increased, 
until in the end the most probable curve, if I may 80 express 
mention in passing, that if subsequent observation confirms this, 
the southern binaries referred to by Mr. Doberck will be reduced 
six. 
Before proceeding to give you some of the results of my 
own work on our southern double stars, it will be necessary 
his is. 
position 
distance ; but in the majorit of cases only six have been is 
When the stars are very eel the method of setting the wae 
frequently adopte 
und more satisfactory than the other method. Ine few aa e 
the distance has been obtained by placing one of the wires the dit 
| d ti ae 
tance of the centres, estimating the distance. hag 11} ineh 2 
circle mit” 
The other telescope, used since 1874, is a very : 
objective, 12}-ft. focus, by Schréder, with position (bright) © 
meter by the same maker, The illumination of W'S © — 
