EEPORTS OF ASTRONOMICAL OBSERVATORIES. 73") 



refractors of 4-inch aperture; one of tliein not cquatorially mount od. 

 One equatorial of 3-inch aperture, aihipted for various latitudes, object- 

 ives by FRAUENnoFER. One equatorial ot ;J-incli aperture, by Dol- 

 LOND. One dialitic equatorial of Plossel, of 5 inches. One comet- 

 seeker, of G-inch aperture, and 4 feet focal length, by Mkuz- mounted 

 equatorially on the principle of Yillareau, by Scn^EiDER. One 

 comet-seeker of 3-inch aperture by Plossel ; one of 2^ inches, by Stein- 

 HEiL. Besides these, various snuiller portable transit instruments, the- 

 odolites, sextants, &c. 



Observations during the past year (1S80— June, 18.S1): 



(a) Adapting instrument to the new Observatory ; not regularly in 

 use. Mostly used for determination of clock error, &c. 



{b') The same remarks applicable. 



(c) (c') Observations made of asteroids and comets. 



Work proposed for the coming year (1881-1882): 



Continuation of observations of asteroids and comets, with the two 

 equatorials: Zone observations (re-observations of stars observed by 

 Santini, between decl. 0° and 10°) with the meridian circle. If the 

 large equatorial of 27 inches by H. Grube, at Dublin, can be mounted 

 in due time, observations with it will be commenced at once; but the 

 plan of operation is not yet settled. 



Principal publications during the year (1880): 



E. Weiss; "Annalen der K. K. Sternwarte in Wien," iii Folge, Bd. 

 29, Vienna, 1881; 1 vol., 226 pp. 



E. Weiss; "Ueber die Bahn der Kometen 1843 (I), and 1880 (&)." 

 AMd. d. Wiss. in Wien, 1880; 1 vol., 20 pp. 



E. Weiss, "Ueber Berechnung der Differentialquotienten in stark 

 excentrischen Bahnen." AJcad. d. Wiss. in Wien, 1881; 1 vol., 11 pp. 



J. HoLETSCHEK; "Bahnbcstimmuug dcs Phineteu Pcitlio." Alad. 

 d. Wiss. in Wien, 1881; 1 vol., 15 pp. 

 Additional information : 



The principal instrument of the Observatory will be an equatorial of 

 27-inch object-glass, and about 32 feet focal length, manutsictured by 

 Howard Grubb at Dublin; but it is not yet out of the contractor's 

 hands. The first Assistant, Mr. J. Palisa, re-discovered Juewa (139), 

 February 23, 1881; and discovered asteroid (220) May 18, 1881. 



Wien, {Josephstadt,) Austria. 

 Ohservatory of the High School of Technology. 



Longitude from Greenwich, 1'' 5" 25^3 E. 

 Latitude, 48° 12' 53".8 N. 

 Directors : J. Herr, 1805 ; 



W. Sinter, 1870. 

 Founded in 1865 at the southwestern extremity of the city; com- 

 pleted in 1867. 



