ASTRONOMY. 43 



Refractor in double-star observations. Up to this time I have dis- 

 covered and measured over 100 new pairs, most of them difficult 

 and interesting objects. The list embraces a number of prominent 

 stars : 8 Andromeda?, 51 Cygni, 47 Tauri, 38 Persei, Aldebaran, etc. 

 Also several of the pairs already known have been found to be triple, 

 as Nos. 17, 171, 366, 2287, 2342, and 2579 of Struve ; 02 336, OS 

 (app.) 220, etc. The larger part of the time has been given to mi- 

 crometrical measurements of the most difficult of pairs already cat- 

 alogued, special attention being paid to pairs supposed to be now 

 single, or too close to measure with ordinary apertures ; and very 

 unequal pairs and doubles generally, which have not been measured 

 since Struve, or within the last twenty or thirty years. The field in 

 these directions is large, and the results obtained will in the end, I 

 think, be more valuable than measures of the recognized binaries 

 and other familiar objects, certain to be attended to by other ob- 

 servers. I expect to follow up this work vigorously during the 

 coming year. No other use is being made of the telescope. It is 

 admirably adapted to this class of work, and probably superior to 

 any instrument in the world, except the Washington 26-inch. 



(Signed) S. W. Burnha^i. 



Cincinnati Observatory, Mount Lookout, Ohio. 



Professor O. Stone, Director. 



1st. Personnel. There is no regularly paid assistant. The director 

 has been greatly aided, however, by two of his pupils, Messrs. Her- 

 bert A. Howe, and Winslow Upton. 



2d. Instruments. The only large instrument is a Munich Refractor, 

 of 28 centimeters clear aperture. The object-glass of this was re- 

 figured, and a new Driving-clock attached in December, 1874, by 

 Alvan Clark and Sons. The observatory is also supplied with a 

 number of subsidiary instruments. 



3d. Observations. Principally the observation of double stars be- 

 tween and 40 south declination. Incidentally a number of new 

 doubles have been detected. A few miscellaneous observations have 

 also been made. 



4th. Publications during 1877. 1. Catalogue of New Double Stars 

 discovered by Mr. H. A. Howe. 2. Micrometrical Measurement of 

 Double Stars, made by Professor O. M. Mitchel in 1846-8, at the ob- 

 servatory on Mount Adams. 3. Micrometrical Measurement of Dou- 

 ble Stars, made in 1875-6, at Mount Lookout (new observatory). 



Pennsylvania College Observatory, Gettysburg, Pa. 



Professor Philip M. Bikle, Director. 



Our observatory is used almost entirely for the general purposes 

 of class-instruction. Like many others, I am so burdened with the 



