PLEASURES OF THE TELESCOPE. 295 



At the lower end of the Sword is the star i, somewhat under 

 the third magnitude. Our three-inch will show that it has a 

 bluish companion of seventh or eighth magnitude, at a little 

 more than 11" distance, p. 142, and the larger apertures will 

 reveal a third star, of tenth magnitude, and reddish in color, 

 distant 49", p. 103. Close by i we find the little double star % 747, 

 whose components are of five and a half and six and a half 

 magnitudes respectively, and separated 36", p. 323. Above the 

 uppermost star in the Sword is a small star cluster, No. 1184, 

 Avhich derives a special interest from the fact that it incloses a 

 delicate double star, 2 750, whose larger component is of the sixth 

 magnitude, while the smaller is of the ninth, and the distance is 

 only 4*3", p. 59. We may try the four-inch on this object. 



Having looked at a (Betelgeuse), the great topaz star on 

 Orion's right shoulder, and admired the splendor of its color, 

 we may turn the four-inch upon the star % 795, frequently re- 

 ferred to by its number as " 52 Orionis." It consists of one star 

 of the sixth and another of sixth and a half magnitude, only 1*5" 

 apart, p. 200. Having separated them with a power of two hun- 

 dred and fifty diameters on the four-inch, we may try them with 

 a high power on the three-inch. We shall only succeed this 

 time if our glass is of first-rate quality and the air is perfectly 

 steady. 



The star A in Orion's head presents an easy conquest for the 

 three-inch, as it consists of a light-yellow star of magnitude three 

 and a half and a reddish companion of the sixth magnitude ; dis- 

 tance 4", p. 43. There is also a twelfth-magnitude star at 27", 

 p. 183, and a tenth or eleventh magnitude one at 149", p. 278. 

 These are tests for the five-inch, and we must not be disappointed 

 if we do not succeed in seeing the smaller one even with that 

 aperture. 



Other objects in Orion, to be found with the aid of our map, 

 are : % 627, a double star, magnitude six and a half and seven, dis- 

 tance 21", p. 2G0. O 2 98, otherwise named i Orionis, double, 

 magnitude six and seven, distance 1", p. 218, requires five-inch 

 glass ; % 052, double magnitudes six and a half and eight, distance 

 1'7", p. 184 ; p, double, magnitudes five and eight and a half, the 

 latter blue, distance 7", p. 62, may be tried with a three-inch ; t, 

 triple star, magnitudes four, ten and a half, and eleven, distances 

 36", p. 249, and 36", p. 60. Burnham discovered that the ten-and- 

 a-half magnitude star is again double, distance 4", p. 50. There 

 is not much satisfaction in attempting t Orionis with telescopes 

 of ordinary apertures ; % 629, otherwise m Orionis, double, magni- 

 tudes five and a half (greenish) and seven, distance 31 "7", p. 28, a 

 pretty object ; 2 728, otherwise A 32, double, magnitudes five and 

 seven, distance 0*5" or less, p. 206, a rapid binary, which is at 



