738 EEPORTS OF ASTRONOMICAL OBSERVATORIES. 



Zi-KA-TVTBi, China. 

 Observatory, 



Longitude for Greenwich, ? 



Latitude, ? 



Director: 1 



Zurich, Sicitzerland. 



Sternwarte des scliweizerisdie^ Polytechnikums. 



Longitude from Greenwich, Si'^ 12^6 E. 

 Latitude, 47° 22' 40" N. 



Authority for latitude and longitude: Astronomische Mittheilungen 

 von Dr. Eudolf Wolf. 

 Directors : J. H. Waser, 1773 ; 



J. Feer, 1787; 



j. eschmann, 1823; 



Rudolf Wolf, 1860; 

 Assistant : Alfred Wolfer. 



Founded in 1773 upon the Carolus Thurm (Charles' Tower), through 

 the efforts of the Ziirich Society of Ii^aturalists. Abandoned from 1798 

 to 1805. In 1810 a new Observatory was erected east of the Carolus 

 Thurm; this was abandoned in 1852. Finally in 18G0 the Observatory 

 was rebuilt at the Polytechnikum, where it was inaugurated in 1863. 



Instruments: 

 (a) Meridian circles : two ; makers, Kern, in Aarau, Ertel, in Munich ; 

 diameter of circles, 20 inches ; divided to 2' ; read by 2 microscopes to 

 0.1" ; aperture of objective, 5.3 inches ; magnifying jDower ordinarily 

 employed, 120.80. 



(c) Equatorial instruments : makers, Kern, in Aarau ; aperture of 

 objective, 6 inches; magnifying power of eye-pieces, 60 to 500. (c') Merz, 

 in Munich, 3J inches ; 64 to 212. 



(d) Spectroscope : one by Merz, in Munich. 



(/) Chronographs: four by Hipp, in N^euchatel, and Hassler, in Aarau. 



(g) ClocTiS : mean time ; makers, Association ou vriere au Locle ; sidereal ; 

 maker, Silvain Mairet au Locle. Also several pendulum clocks, among 

 which one by Repsold. 



{h) Chronometer: sidereal; seconds chronometer; maker, Buzen- 



GEIG-ER. 



(i) Miscellaneous : Several astronomical theodolites, meteoroscopes, 

 panagenprisms, &c. ; also historical collection of antique instruments. 



Observations during the past year (1880): 



(a) Time determinations ; refraction, &c. ; moonstars. 

 (c) ((/) Sunspots ; planets, &c. 

 {%) Shooting stars. 



