G-42 EEPORTS OF ASTRONOMICAL OBSERVATORIES. 



Observations during the past year (from January to 

 December) : 

 (c) Stellar spectrum photographs, with 28-iuch reflector of « Lyrce. a 

 Aquila\ a Bootis, a Scorpio7iis, Capella, Jupiter, Mars, &c. 



{(■) {&) Photographs of the nebula iu Orion, with 11-inch photographic 

 telescope, the first ever taken, and requiring an exposure of 51 minutes. 

 Work proposed for the coming year (1881) : 

 -Continuation of the above, with a series of experiments in physics as 

 bearing on astronomy, in the new astro-physical laboratory in New York ; 

 the latter experiments especially directed to the presence of the non- 

 metals in the sun The town laboratory is furnished with a siderostat 

 with 9i-inch min or, a gas engine of i-horse power, 4 dynamo-electric 

 machines, induction coils and spectroscopes, «&c., suitable for the 

 research. 



Haverford College, Montgomery County, Pennsylvania. 

 Haverford College Ohservatory. 



JiOngitude from Washington, 6™ 59^33 E. 



Latitude, 40° 0' 36".5 N. 



(Triangulations from United States Coast Survey stations give : 



Longitude, 5'' 1' 11".62 ; latitude, 40° V 49".73.) 



Director : Isaac Sharpless. 



Assistant : William Bishop. 

 Instruments : 



((() Meridian circle: one; diameter of circles, 26 inches; divided to 

 15' ; read by 4 microscopes to 2"- aperture of objective, 4 inches 



[c) Equatorial instrument : makers, Henry Fitz, re-worked by Clark ; 

 aperture of objective, 8^^ inches ; magnifying powers of eye-pieces, 60 

 to 800. 



(/■) Chronograph: Bond's magnetic. 



{g) Clocl's: one sidereal; maker, Lukens: one sidereal; maker. Har- 

 per ; mercurial compensation. 



(i) Zenith instrument : aperture, 2J inches : rejuvenated by Fauth 

 & Co., and to be set up as soon as addition is built to observatory, to 

 determine our latitude. 



Observations during the past year (from 9 mo., 1st, 1880, to 

 3 mo., 1st, 1881): 



{a) Time observations. 



(f) ((/) Phenomena of Jupiter's satellites; occultations by moon; 

 double- star measures. 



Work proposed for the coming yeah (1881-'82) : 

 Continuation of the aboAC. 



