of Double Stars, 4 ? 
have now introduced and uled in ail the anodes of the folio .vino- 
0 6 
catalogue *, 
Datchet nearWLndfor, Nov. I, 17 84. W. HERSCHEL, 
CATALOGUE OF DOUBLE STARS. 
FIRST CLASS. 
I. 25. A Orion is. Fl. 32. Sub humero in confequentia. 
jan. 20, Double. Coufiderably unequal. L. fine w. ; S. w. 
1782. inclining to pale rofe colour. The difiance or black 
divifion between the two fiars with 278 is about § dia- 
meter of L. ; with 460, near § diameter of L. Poli- 
tion with 278, 52° io' f. preceding. 
26. co Leonis. Fl. 2. Anteriorem pedem dextrum praecedens. 
Feb. 8. A very minute double fiar. Confiderably unequal. 
1782. Both r. With 227 there is not the leafi fufpicion of 
its being double; with 460 it appears oblong, and, 
when perfectly diliinci, we fee £ of the apparent dia- 
meter of a fmall fiar as it were emerged from behind a 
larger fiar ; with 932 they are more clear of each other, 
but not feparated ; the focus of every power adjulied 
upon the 3d and 6th Leonis. November 6th, 1782, I 
The divifions on the moveable circular index ( a ) of this micrometer fhould 
be read off by means of a line drawn on a fmail plate fattened to the ttde r, and 
projecting with a proper curvature again ft the plane of the divifions towards r, fo 
as to be nearly in contact j a coincidence of lines being by far the beft method of 
ascertaining the fituation of the index. A nonius of four fub* divifions may alfo 
be uied, whereby the 60 divifions, already divided into halves upon the index- 
plate, will be had in eighths, each of which, on the conftrubtion of my prefent 
©ne, will be equal to three minutes of a degree of the circle, 
7 firfl 
