EEPORTS OF ASTRONOMICAL OBSERVATOKIES. G93 



Directors: J. A. Von Segner, 1735; 

 J. Tobias Mayer, 1754 ; 



G. M. LORNITZ, 17G2 ; 

 • A. G. Kastner, 1704; 

 K. F. VON Seyffer, 1800; 

 0. F. Gauss, 1807; 

 Dr. E. F. W. Klinkerfues, 185G. 

 Assisiant: D. IIeidorn, calculator. 



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

 one of the round towers of the ancient fortification, around which was 

 built an exterior gallery. In 1811 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 maker was J. G. Repsold. 

 Instruments: 

 (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 4^ inches (114'^"'); magnifying power ordinarily em- 

 liloyed, 90 diameters: one made by Reichenbacii, of ]\[unich; diame- 

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

 aperture of objective 4:^ inches (lOO'""'); magnifying power ordinarily 

 employed, 50 diameters. 



{h) Meridian transit instrument: maker, Reichenbacii, of ^Munich; 

 aperture, 4^ inches (110"'™); magnifying power, 75 diameters; (//) one 

 portable, maker, Ertel, of Munich. 



(c) Equatorial instrument: maker, Frauenhofer, of Munich; aper- 

 ture of objective 2.9 inches (74™"^); magnifying power of eye-piece, 75. 

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

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

 3d, DOLLOND, of Munich; 4 feet long, aperture 3i inches; 4th, Dol- 

 LOND, of Munich; 3 feet long, aperture 3 inches; 5th, Plossl, of 

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

 makers, 1st, Merz, of Munich; G inches aperture; 2d, Merz, of Mu- 

 nich; 3 inches aperture; 3d, Voigtlander, of Brunswick; 2i inches 

 aperture. 



(d) Spectroscope: by Merz, of Munich. 

 (/) Chronograph: by Ausfeld, of Gotha. 



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

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



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

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



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

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



