642 REPORTS OF ASTRONOMICAL OBSERVATORIES. 



Observations during the past year (from January to 

 December) : 

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

 Aquilw, a Bootis, a Scorpionis, Gapclla., Jupiter, Mars, &c. 



(o) (c') Photographs of the nebula in Orion, with 11 -inch photographic 

 telescope, the first ever taken, and requiring an exi^osure 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 f 

 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 mirror, a gas engine of 4-horse power, 4 dynamo-electric 

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

 research. 



Haverford College, Montgomery County, Pennsylvania. 

 Haverford College Observatory. 



Longitude from Washington, 6" 59^33 E. 



Latitude, 40° 0' 36".5 N. 



(Triangulations from United States Coast Survey stations give : 



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



Director : ISAAC Sharpless. 



Assistant : WiLLiAM Bishop. 

 Instruments : 



{a) 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, CO 

 to 800. 



(/) Chronograph : Bond's magnetic. 



[g) Clovlcs : one sidereal ; maker, Lukens : one sidereal ; maker. Har- 

 per ; mercurial compensation. 



(/) Zenith instrument : aperture, 2| 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. 



{c) {&) Phenomena of Jupiter's satellites ; occultations by moon; 

 double-star measures. 



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



Continuation of the abo^'e. 



