Double-Stars discovered by Alvan G. Clark. 287 
No. 9. y Lyre. (OZ 544.) 
This pair, discovered a number of years since with the 
12-inch glass now at the Vienna Observatory, is one of the 
recently published additions to the Pulkowa Catalogue. It 
has been measured as follows: 
Otto Struve ..P=296°-9 D=137°79 1868°6 3n 
97° 12°48 18745 1-4n 
Burnham .__- 301°1 12-76 1878°4 2n 
No. 10, P XIX, 257. (AC=22570=m 1. 91=S 723.) 
This has been known as a wide pair nearly a century. 
_ With the Draper 12-inch, the large star in August, 1875, was 
found to be an excessively close pair. I have measured this 
_ with Dearborn Observatory refractor on four nights, as follows: 
=126°°1 fesgoes 
147°4 bogs 187772 
147°0 D=0"'26 1878°62 
142°0 0°32 1878°70 
There is no evidence of change in the 95 magnitude star, 
as will appear from the following observations : 
Herschel 1._..._....P=278°°2 ae 1783°6 In 
SuuVve 0 276°2 D=—4”"-08 1827°0 3n 
Miche Q75°7 3°95 1847°7 n 
Bevchi <2 o 42 ee 275°3 4°10 1857°6 In 
Wilson and Seabroke_ 279°9 3°87 1874°1 2n 
Wilson and Seabroke. 277°8 4°30 1876°7 In 
urnham. 76°6 4°16 1878°7 ln 
No. 11. € Sagitte, (AC=22585= g II. 30=SA 307.) 
__ Discovered as a wide pair in 1781 by Herschel I. It was meas- 
ured by many observers down to 1875, when the duplicity of 
_ the principal star was detected with the same instrument with 
_ which the two preceding discoveries were made. My measures 
_ of this at the Dearborn Observatory indicate an increase in the 
distance. I found it obviously less difficult in 1878 than the 
_ previous year. The individual measures are as follows: 
P=158°3 —0"-22 1877°72 
157°6 0°24 1877°73 
‘ 158°1 0°27 1877°77 
158°7 0°35 1878°64 
155°4 0°35 1878°70 
___Struve gives the magnitutes, 5°7 and 8°7, of the wide pair. 
_ These stars appear to be relatively fixed. 
Struve ... Fe, P—312°3 D=—s°-49 1831°1 In 
O: Strave foe 311°2 8°71 1846°9 In 
Wr 311°8 8-77 18546 8” 
eee ee ee oe 
rottesley 
Wilson and Seabroke - 311°2 8°8 1873°6 In 
