218 



PHILOSOPHICAL TRANSACTIONS. 



[anno 1782. 



18. i Bootis, Fl. 37. 



April 9, 1780. — Double. Very unequal. L pale 

 r, or nearly r. S garnet, or deeper r than the other. 

 With 22'?, In diameter of L, with 460, fall 3 dia- 

 meters of L. Distance 3" 23'" single measure. Po- 

 sition 6 j° 53' n following. 



iii. g Serpentarii, Fl. 5. 



]y] a y <j, — Double. It is a star in the body of 

 Cancer, and the double star is at the angular point of 

 the 3 telescopic g's making a rectangle. Pretty un- 

 equal. Both w. With 227, 1 i diameter of L. Po- 

 sition 82° 10' s preceding. 



2ii and 21. I Librae, Fl. ultima. 



May 2.3, i?SU. — Double double. The first set 

 very unequal. L fine w. With 227, nearly 2 dia- 

 meters of L.* By the micrometer 6" 23'", but too 

 large a measure. Position 1° 23' n following. The 

 other set both small and obscure. With '227, perhaps 

 5 or 6 of their diameters asunder. 



22. i Persei, Fl. 45. In sinistro genu. 



Aug. 2, 1780. — Double. Extremely unequal. L 

 w; S d. With 222, 2 J diameters of L. Position 

 81° 28' s following, a little inaccurate. A 3d star 

 near at about 1 h or 1 f min. 



23. In constellatione Serpentarii, near Fl. 1 1 . 

 Aug. 7. — Double. It is the smaller and preceding 



of 2 in the finder. Pretty unequal. L pale r ; S 

 dusky r. With 222, about l£ diameter of L; with 

 278, about lj diameter of L; with 46u, above 2 

 diameters of L. Position 46° 24' n preceding. A 

 little inaccurate. 



24. In constellatione Aquarii, Fl. 107. In se- 

 quenti flexu 4 a ad a . 



Aug. 23. — Double. In Harris's maps it is marked 

 i. Unequal. With 227 , 2 diameters ; with 460, 

 about 3 diameters. 



25. k Cygni, Fl. 59. 



Sept. 8. — Double. Extremely unequal. L w in- 

 clining to r ; S d. and extremely faint ; with 227, 2j 

 diameters of L ; with 46"0, about 4 diameters of L, 

 or more. Position 31° 3' n following. 



26. In constellatione Ononis, near Fl. 4 2. In 

 longo ensis. 



Oct. 23. — Double. It is the most north of 3 teles- 

 copic stars in a line at the end of a cluster near c. 

 Extremely unequal. Lw; S d. With 278, l| 

 diameter of L. Position 26° 5' n following. 



27. ^Geminomm, Fl. 55. In inguine sinistro se- 

 quentis II'. 



March 13, 1781. — Double. Extremely unequal. 

 Lw inclining to r; S r. With 227, about .J full 

 diameters of L; with 460, 4 or 5 diameters. Posi- 

 tion 85° 51' s preceding. 



28. In constellatione Aquilae, near Fl. 54. 



July 23. — Double. It is a star following o. Ex- 

 cessively unequal . The small star is not visible with 

 227, nor with 278. It is visible with 460 ; but not 

 without attention. Distance with 46*0, about 4 or 5 

 diameters of L. Position, by very exact estimation, 

 36° 28' n preceding. 



* In a future collection this set will be found as a tieble star 

 of the fust class, the large white star, with a power of 460 and 

 9Si, appearing to be 2 stars — Orig. 



2.9. In constellatione Aquilae, near Fl. 63. In 

 medio capite. 



July 31. — Double. It is the star at the vertex of a 

 telescopic isosceles triangle near r. Extremely un- 

 equal. Both r. With 400, 2 diameters of L. Po- 

 sition 75° 4S' n preceding. 



o0. £ Sagittae, Fl. 8. Trium in arundine sequens. 



Aug. 23. — Double. Extremely unequal. The small 

 star brighter with -100 than with 227 or with 278; 

 with 160, between 4 or 5 diameters of L ; with 278, 

 2 1 diameters of L. Distance 5" 27'" inaccurate. 

 Position 34° 1 0' n preceding. 



31. In constellatione Draconis, Fl. 56. 



Sept. 6. — Double. A little unequal. Both \v. 

 With 40O, near 3 diameters. Distance 5" }"'. 



32. In constellatione Sagittae, near Fl. 4. 



Sept. 7 . — Double. It is the star north following t. 

 L pale r ; S d. Distance J' 3'" inaccurate. 



3 1. /3 Orionis, Fl. 19. In sinistro pede splendida. 



Oct. 1. — Double. Extremely unequal. L w; S 

 inclining to r. With 2. '7, 2^ or 2\ diameters of 

 Bigel. With 400, more than 3 diameters of L. 

 Distance 5" 27"'. Position 68° 12' s preceding. The 

 small star not wanting apparent magnitude is better to 

 be seen with my power of 227 than with 46'u. 



34. Trianguli, Fl. 0. 



Oct. S. — Double. It is marked b in the small tri- 

 angle of Harris's maps. Very unequal. L pale r or 

 reddish w ; S blueish r. With 227, full I \ diameter 

 of L; with 460, full lj diameter of L. Position 

 4° 23' n following. A pretty object, somewhat re- 

 sembling «. Herculis, but smaller, and not so bright. 



35. In constellatione Trianguli, near Fl. (i. 



Oct 8. — Double. It is the star following t. Equal. 

 Both dusky w. With 400, about 2.", diameters. 



3d. In constellatione Eridani, Fl. 32. 



Oct. 22. — Double. Considerably unequal. L red- 

 dish w ; S blue. Distance 4" 19'". Position 73° 23' 

 n preceding. 



37- In capite Monocerotis. 



Oct. 22. — Double. It is one of a cluster of 6 

 telescopic stars, arranged in pairs. 



38. In constellatione Bootis. 



Dec. 24. — Double. It is the most north and 

 largest of 3 in a line, s following Fl. 15. Consider- 

 ably unequal, L w ; S inclining to r. Distance 5" 10'". 

 Position 83° 5' s preceding. 



Third Class of Double Stars. 



1. f Orionis, Fl. 41. Trium contiguarum in 

 longo ensis media. 



Nov. 1 1, 1770. — Quadruple. It is the small teles- 

 copic Trapezium in the Nebula. Considerably un- 

 equal. The most southern star of the following side 

 of die Trapezium is the largest ; die star in die oppo- 

 site corner is the smallest ; the remaining 2 are nearly 

 equal. L pale r; the star preceding I, inclined to 

 garnet ; following L inclined to garnet ; opposite to 

 L d. With 460, the stars are all full, round, and 

 well-defined. The 2 stars in the preceding side dis- 

 tance 8". 7 80; in the southern side, 12".812 ; in 

 the following side I5".208; in the northern side, 

 20". 396. 



2. C, Ursae majoris, Fl. 5i). Trium in cauda media. 



