I 
of Double Stars* 
*47 
37. v Coronas, fl. 18. 
Sept. 21, Treble. Very unequal. L. w. ; S. both r. Dif- 
1 7 ^ 1 - tance of the neared about $0" ; the if min. j 
3^. In conftellatione Herculis, fl. 23, 
Sept. 2 1, Double. It is the dar between v and £ Corona, 
I 7 ^ 1 * the larged of a telefcopic triangle. Didance 
36" 2 rather narrow meafure. L. w. ; S. w. 
inclining to r. 
39. a Lyras, fl. 3. In teda fulgida. 
Sept. 24. Double. Exceffively unequal. By moon-light I 
J 78i. could not fee the fmall dar with 278, and faw it with 
great difficulty with 460 ; but in the abfence of the 
moon 1 have feen it very well with 227. L. fine 
brilliant w. ; S. dufky. Didance 37" 13"'. Por- 
tion 26° 46' f. following. 
061.22, Having often meafured the diameters of many of 
*781. the principal fixed dars, and having always found that 
they meafured lefs and lefs the more I magnified, I 
fixed upon this fine dar for taking a meafure with 
the highed power I have yet been able to apply, and 
upon the larged fcale of my new micrometer I could 
conveniently ufe. With a power of 6450 (deter- 
mined by experiments upon a known object at a 
known didance) I looked at this dar for at lead a 
quarter of an hour, that the eye might adapt itfelf 
to the objedt ; having experimentally found, that 
the aberration by this means will appear lefs and lefs, 
and, in the telefcope I ufed upon this occafion with 
powers from 460 to 1500, will often quite vaniffi, and 
+ In a future colle&ion the fmall ftar at the obtufe angular point will be found 
as a double liar of the fecond or third clafs. 
U 2 
leave 
