VOL. LXXII.J 



PHILOSOPHICAL TRANSACTIONS. 



217 



April 8, 1778. — Double. A little unequal. Both 

 w. The vacancy between the 2 stars, with a power 

 of 146, is 1 diameter of S; with 222, a little more 

 than I diameter of L; with '227, l| diameter of S; 

 with 466, near 2 diameters of L ; (see fig. 6") with 

 754, 2 diameters of L; with 1)32, full 2 diameters of 

 L; with 1 536, very fine and distinct, 3 diameters of 

 L; with 3 l6S, the interval extremely large, and still 

 pretty distinct. Distance by the micrometer 5". 156. 

 Position 32° 47' n preceding. These are all a mean 

 of the last 2 years observations, except the first 

 with 146. 



2. + * Herculis, Fl. 64. In capite. 



Aug. 2;>, 1779. — A beautiful double star. Very 

 unequal. Lr; S blue inclining to green ; the colours 

 •with every power the same. The interval with 222, 

 lj diameter of L; with 227, above 2 diameters of L; 

 with 932, above 3 diameters of L. Distance 4".966. 

 All a mean of 2 years observations. A single measure 

 with my last new micrometer, from centre to centre, 

 4" 34'". Position 3<>° 35' s following. 



3. *£ Herculis, Fl. 75. Trium in sinistro femore, 

 tertia. 



Aug. 29. — Double. Pretty unequal. Both w. 

 With 227, 1 5 diameter of L ; with46(), 2 diameters 

 ofS. Distance 2".969. Position 30° 21' n preceding. 

 The measures a mean of 2 years observations. 



4. * p Serpentarii, Fl. 70. Tres has sequitur, quasi 

 supra mediam. 



Aug. 29. — Double. Considerably unequal. Lw; 

 6 inclining to r. With 227, If diameter of L; with 

 460, much above 2 diameters of L. Position y° 14' 

 s following. Mean of 2 years observations. 



5 et 6. * t Lyra, Fl. 4 and 5. 



Aug. 29. — A very curious double-double star. At 

 first sight it appears double at some considerable dis- 

 tance, and by attending a little we see that each of the 

 stars is a very delicate double star. The first set con- 

 sists of stars that are considerably unequal. The stars 

 of the 2d set are equal, or the preceding of them ra- 

 ther larger than the following. The colour of the stars 

 in the first set L very w; S a little inclining to r. In 

 the 2d set both w. The interval between the stars of 

 the unequal set, with a power of 227, is full 1 dia- 

 meter of L; with 460, near 1 h diameter of L; with 

 932, full 1 J diameter; with 2(>]o, 2£ diameters. The 

 interval between the equal set with a power of 227 is 

 almost lg diameter of either; with 460, full l| dia- 

 meter; with 932, 2 diameters; with 2010, 2 2 dia- 

 meters. These estimations are a mean of 2 years ob- 

 servations. Position of the unequal set 56° 0' n fol- 

 lowing. Position of the equal set 72° 57' s following. 



7. * Z, Aquarii, Fl. 55. Trium in manu dextra 

 prscedens. 



Sept. 12. — Double. Equal, or the preceding rather 

 the larger. Both w. Widi 227, I5 diameter; with 

 449, "l^ diameter; with460, 2 diameters; with 910, 

 near 2 diameters; with 932, 2 \ diameters; with 2010, 

 pretty distinct; but too tremulous to estimate. With 

 my 20-feet reflector, power 600, full 2 diameters, 

 very distinct. Position 71° 39' n following. Distance 

 4".56, mean of 2 years observations. 



VOL. XV. F 



8. £ Coronae borealis, Fl. 7- 



Oct. 1. — Double. Considerably unequal. L fine 

 w; S w inclining to r. With 222, almost 3 diameters 

 of L. Distance 5".4<>8. Position 25° 51' n preceding, 

 mean of 2 years observations. 



9. * Orionis, Fl. 39. In capite nebulosa. 



Oct. 7. — Quadruple, or rather a double star and 2 

 more at a small distance. The double star consider- 

 ably unequal. Lw; S pale rose colour. With 222, 



1 h diameter of L ; with 44'), above 2 diameters of L. 

 Distance 5".8 S3, a mean of all the measures. Posi- 

 tion 45° 14' n following. As every one of the 4 stars 

 is perfectly distinct, it is evident that the whole ap- 

 peared nebulous to Flamsteed for no other reason than 

 because his telescope had not sufficient power to distin- 

 guish them. 



10 and 11. ir Orionis, Fl. 48. Ultiman cinguli 

 praecedit ad austrum. 



Oct. 7 • — A double-treble star, or 2 sets of treble 

 stars, almost similarly situated. Preceding set. The 



2 nearest equal; the 3d larger and, compared with 

 either of the former 2, pretty unequal. The 2 nearest 

 with 222, about 2 diameters. Position of the follow- 

 ing star of the 2 nearest with the 3d 6t>° 35' s preced- 

 ing. Position of the 2 nearest, by exact estimation, 

 2 or 3° n following or s preceding the following set. 

 The 2 nearest very unequal. The larger of the 2 and 

 the farther considerably unequal. L w; S blueish. 

 The 2 nearest with 222, about 2j diameters of L ; the 

 2 farthest 43" 1 2'". Position of the 2 nearest 5° 5' n 

 following. Position of the 2 farthest 29° 4' n follow- 

 ing. A pretty object with 227. 



12. « Piscium, Fl. ultima. In nodo duorum linorum. 

 Oct. 19. — Double. Considerably unequal. Both 



w. With 222, not quite 2 diameters of L ; with 460, 

 about 3 diameters of L. Distance 5". 123 mean mea- 

 sure. Position 67° 23' n preceding. 



13. j«. Draconis, Fl. 21. In lingua. 



Oct. 19. — Double. Equal. Both w. With 227, 

 1 5 diameter; with 460, 2| diameters. Distance 

 4".354 mean measure. Position 37° 38' s preceding or 

 n following. 



14. <•> Aurigae, Fl. 4. 



Oct. 3d. — Double. Very unequal. L w; S r. 

 With 227, almost 2 diameters of L ; with 460, full 3 

 diameters of L. Position 82° 37' n preceding. 



15. ^ Cygni, Fl. 24. In ala dextra. 



Nov. 2. — Double. Extremely unequal ; the small 

 star a mere point. Lw; S r. With 227, near \\ 

 diameter of L; with 278, near \\ diameter of L; 

 with 460, 2 diameters of L. Position 89° 32' n pre- 

 ceding. 



16. I Cephei, Fl. 17. In pectore. 



Nov. 7 . — A fine double star. Considerably unequal. 

 L w inclining to r; S dusky grey. With 222, nearly 

 2 diameters of L. Single measure 5".00. Position 

 20° 1 8' n preceding. 



17. * In sinistro anteriore pede Monocerotis, Fl. 11. 

 Dec. 5. — Double. With 222, about 1 \ diameter. 



Position (taken Oct. 20, 178 1 ) with the farther of the 

 other 2 stars 31° 38' s following. See the 10th star 

 in the first class. 



