38 M. Mitchell on some of the Double Stars. 
Art, IV.—Observations on some of the Double Stars; by MARIA 
MITCHELL. 
Tus instrument with which these observations were made is 
a five-inch equatorial telescope, by Alvan Clark. 
I have not attempted to measure the double stars of a distance 
less than 2”, even where I considered the telescope capable of the 
work, supposing that I should better meet their difficulties after 
longer practice in micrometrical measurements. Previous to 
October, 1861, the observations were made at Nantucket, in 
lat. 41° i 
I have taken great pains to notice the colors of the stars be 
fore my eye was fatigued, and have frequently noticed compara 
tive colors. The terms yellow, pale yellow, ruddy, &c., are very 
vague; Sirius, «Geminorum and Capella are called white by 
observers, but they are decidedly unlike in color. If a color — 
scale, made from certain stars, could be adopted, to which other | 
stars could be referred, the errors of eyes and observers would — 
be eliminated; but an analysis of the ray from each star cal — 
alone decide the question of real likeness. q 
Angl No. " No. 
Name of Star. Date. rt at | eed ik 
Position. Obs,| °° |Obs. 
35 Piscium, 1860, Jan. 2, | 152°-2 11’"-9| 2 |The color of the sme a 
peculiar; there is abrowa) 
mingling with its reddish 
light. he is 
light ager The two re- 
sem t 
et ated 1860, Jan. 8, | 154 -4 2 
1862, Nov. 23, 149 °4 Small star reddish-brown 
1862, Nov. 30,| 150 Air not clear. 
. ‘ . 30, 1 “t : 
38 Piscium, 1860, Jan. 9, | 243 -5 4 ie siscib ities dene ta bole 
j« © ——— |1g62, Nov. 28 237 «9 6 | 3 -4 
eS 3 +3] 6 4 
[25 Cassiopie, 1860, Nov.8, | 354 -3| 3 [5g -6| 3 |The colors are yellow and} 
2 | © Bev. 16, | [59 : 
