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Directors: J. A. VON Segner, 1735.
J. Tobias Mayer, 1754.
G. M. Lornitz, 1762.
K. F. von Seypeer, 1800.
Dr. E. F. W. Klinkerfues , 1866.
Founded in 1734, at the same time with the university, and locatedin one of the round towers of the ancient fortification, around whichwas built an exterior gallery. In 1811 the observatory was transferredto a more suitable spot outside the southern gate-way of the town. Thisnew building is on the plan of a rectangle, with the longer sides facingeast and west. An addition is made by wings to the north; a cupolasurmounts the central vestibule, and a terrace encircles the whole struc-ture. In 1818 the first meridian circle ever made and mounted in Europe was placed there.
Instruments :
(a) Meridian circles: One made by Eepsold, sr., of Hamburg; diam-eter of circle 3J feet, divided to 5'; read by two microscopes to 1 "; ap-erture of objective 41 inches (114 mm ); magnifying power ordinarily em-ployed, 96diameters: one made by Beichenbach, of Munich ; diame-ter of circle 3 feet; divided to 3'; read by four microscopes to 0.24";aperture of objective inches (109 mm ); magnifying power ordinarilyemployed, 50 diameters.
(b) Meridian transit instrument: Maker, Beichenbach, of Munich ;aperture, 4J inches (116 mm ); magnifying power, 75 diameters; (b 1 ) oneportable, maker, Ertel, of Munich .
( c ) Equatorial instrument: Maker, Frauenhofer, of Munich ; aper-ture of objective, 2.9 inches (74 mm ); magnifying power of eye-piece, 75.(&) 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, 3£ inches; 4th, Dol-lond, of Munich; 3 feet long, aperture 3 inches; 5th, Plossl, of Vi-enna ; 28 inches long, aperture 2^ inches. Three comet-seekers: makers,1st, Merz, of Munich; 6 inches aperture; 2d, Merz, of Munich ; 3inches aperture; 3d, Voigtlander , of Brunswick; 2 J inches aperture.
(d) Spectroscope: By Merz, of Munich .
(f) Chronograph: By Ausfeld, of Gotha.
(g) Clocks: One mean time; maker, Fastens; two sidereal: makers,1st, Hardy, of London ; 2d, Shelton.
(h) Chronometers: Four mean time; makers, 1st, Bertiioud ; 2d,Sackmann; 3d and 4tli, Knoblich; 5th, Hardy; sixtieth part of asecond.
(i) Miscellaneous : Heliometer by Frauenhofer, of Munich ; theodo-