264 Mr , H r, R scH E L m the 



fouth preceding the fame flar ; very exad, and by the fiime 

 kind of illumination. Od., 17, i7^'3, Diftance 6' 55^'' 7'''^ ; 

 a iecond mealure 6^ 56^^ 11'''''', ns exact as poflible. Od. 23, 

 i 783, l^ofjtion 42^ 57^ ; a fecond meafure 42° 45^ ; fingle lens ; 

 power 71 ; opaque microfcopic-illumination. Nov. 14, 1783, 

 Diflance 7' 4'' 35"" Nov. 12, 1784, Diflance 7^ 22'^ 35"^^ ; 

 Pofition 38'' 39^ Its diameter is about loor 15^''. I haveexa- 

 miiicd it with the powers of 71, 227, 278, 460, and 932 ; 

 nnd it follows the law^s of magnifying, fo that its body is no 

 illuf on of light. It is a little oval, and in the 7-feet reflector 

 pretty well defined, but not fharp on the edges. In the 20-feet, 

 of 18,7 inch aperture, it is much better defined, and has much 

 of a planetary appearance, being all over of an uniform bright- 

 nefs, in which it differs from nebulae : its light feems however 

 to be of the ftarry nature, which fuffers not nearly fo much as 

 the planetary difks are known to do, when much magnified. 



The fecond of thefe bodies precedes the 13th of Flam- 

 steed's Andromeda about 1^6 in time, and is 22^ more fouth. 

 It has a round, bright, pretty well defined planetary difk of 

 about 12^^ diameter, and is a little elliptical. When it is viewed 

 with a 7-feet reflector, or other inferior inftruments, it is not 

 nearly fo well defined as with the 20-feet. Its lituation with 

 regard to a pretty confiderable flar is, Diftance (with a com- 

 pound glafs of a low power) f 51^^34^^'. Pofition i2°o' f. 

 preceding. Diameter taken with 278, 14^'' 42^^^. 



The third follows B (Fl. 44.) Ophiuchi 4^,1 in time, and 

 is 23^ more north. It is round, tolerably well defined, and 

 pretty bright ; its diameter is about 30^^ 



piece, that may throw it back upon the wires. By this means none of the direct 

 rays can reach the eye, and thofe few which are reflefted again from the wires do 

 not interfere fenfibly with the fainteft objeds, which may thus be fecn undif- 

 turbed. \ 



The 



