415
i
Universitats-Sternwarte.
Longitude from Greenwich, 42™ 53.65 s E.
Authority for longitude and latitude: Beschreibung und Lage der Uni-versitats-Sternwarte in Christiania ; Verhandlungenderfiiufteuallgemeinen Conferenz der europaischen Gradmessung, p. 300;Exped. chronom. exdcutde en 1844 entre Alton et Greenwich .Directors: C. Hansteen , 1815.
C. Fearni.ey, 1873.
Projected in 1815; constructed in 1818; rebuilt at some distancefrom the first structure in 1830.
Instruments :
{a) Meridian circles : One; makers, Ertel, with objective by Frau-enhofer and Utzschnbider : diameter, 38 inches; divided to 3',read by 4 microscopes to 2"; aperture of objective, 4 inches; magni-fying power, 180 diameters.
(b) Portable transit instrument: Pistor & Martins, makers; aper-ture of objective, 2 inches; magnifying power, 80 diameters.
(c) Equatorial by A. & G. Repsold. Diameter of circles, 30 inches,divided to 3'; read by 2 microscopes to 1"; aperture of objective, 4£inches; magnifying power, 50-290. Wire micrometer and ring micro-meter. (o') Refractor: Makers, G. Merz & Soiine; objective, 7inches; magnifying power, 80-600; diameters of circles 10 and 14 inches;read by 2 Noniers each to 4 s and 10". Wire micrometer.
( d ) Small universal star-spectroscope by Merz, a vision directe.
{()') Clocks: One sidereal: pendulum, by Kessels, 1365 ; one meantime, by Urb. Jurgensen og Sonner (for the bifilar): one by L.Lamtvork (for the unifilar); F in the magnetic building.
(h) Chronometers : Mean time ; (Box) Kessels, 1259; (Pocket) Kes<sels, 1280 : one sidereal; Dent, 2103.
( i) Unifilar magnetometer, by Meyerstein ; bifilar magnetometer,by Meyerstein inclinatometers, by Gambey, Barlow, Dover; siphonbarometer, by Pistor ; cistern barometer, by Fortin ; thermometers,pluviameters, etc.