PvEPORTS OF ASTRONOMICAL OBSERVATORIES. COn 



Directors: J. A. Yon Segner, 1735; 

 J. Tobias IMayer, 1754 ; 

 G. M. LoRNiTZ, 17G2 : 

 A. G. Kastjner, 1704: 



K. F. VON SeYEFER, 1800; 



C. F. Gauss, 1807; 

 Dr. E. F. W. Kltnkereues, 1856. 

 Assistant: D. Heidorn, calculator. 



Founded in 1734, at the same time with the University, and located in 

 ■one of the round towers of the ancient fortiticatioii, around which was 

 built an exterior gallery. In 18U the Observatory was transferred to a 

 more suitable spot outside the southern gate-way of the town. This new 

 building is on the plan of a rectangle, with the longer sides facing east 

 and west. An addition is made by wings to the north, a cupola sur- 

 mounts the central vestibule, and a terrace encircles the whole struct- 

 ure. In 1818 the first meridian circle ever made and mounted in Europe 

 was placed there. The nudvcr was J. G. Repsold. 

 Instrujvients: 



(a) Meridian circles : one made by Repsold, sr., of Hamburg; diame- 

 ter of circle, 3 J feet, divided to 5' ; read by two microscopes to 1" ; aper- 

 ture of objective 4i inches (114"""); magnifying power ordinarily cm- 

 ployed, 96 diameters: one made by Reichenbacii, of ;>runich; diame- 

 ter of circle 3 feet; divided to 3'; read by four microscopes to 0.24"; 

 aperture of objective 4;| inches (109"""); magnifying i)owcr ordinarily 

 employed, 50 diameters. 



(b) Meridian transit instrument: maker, REirnENBAcn, of .Alnnidi; 

 aperture, 4i inches (116™""); magnifying power, 75 diameters; (//) one 

 portable, maker, Ertel, of Munich. 



(c) Equatorial instrument: maker, FrAUENHOFER, of :\runicli: aper- 

 ture of objective 2.9 inches (74'""'); magnifying i)Ower of eye-piece, 75. 

 (c') Five telescopes: makers, 1st, Merz, of Munich; 6 feet long, aper- 

 ture 5 inches; 2d, Steinheil, of Munich; 5 feet long, aperture 4 inches; 

 3d, DOLLOND, of Munich; 4 feet long, aperture U inches; 4tli, DoL- 

 LOND, of Munich; 3 feet long, aperture 3 inches; 5tli, Flossl, of 

 Vienna; 28 inches long, aperture 2^ inches. Three comet-seekers: 

 makers, 1st, Merz, of Munich; 6 inches aperture; 2d, ]\rERZ, of Mu- 

 nich; 3 inches aperture; 3i\, Yoigtlander, of Urunswick; 2^ inches 

 aperture. 



{d) Spectroscope: by Merz, of ]\Iunich. 



(/) Chronograph : by Ausfeld, of Gotha. 



{(j) Clods: one mean time; maker, Castens; two sidereal: makers, 

 1st, Hardy, of London; 2d, Shelton. 



(h) Chronometers: four mean time; makers, 1st, Bertuoud; 2d, Sack- 

 mann; 3d and 4th, Knoblich; 5th, Hardy, sixtieth part of a second. 



(i) Miscellaneous: heliometer by FRArENHOFER, of Munich ; theodo- 

 Utes, one by Reichenbach, two by Meyerstein; sextants by Cary, 



