736 EEPORTS OF ASTKONOMICAL OBSERVATORIES. 



WiLHELMSHAVEN, Germany. 

 Kaiserliches Marine Ohservatorium. 



Longitude from Greenwicli, 32i" 35«.21 E. 



Latitude, 53° 31' 52".2 N. 



Authority for longitude: Astronomisclie Arbeiten des kgl. preuss. 

 geodatisclien lustituts fiir 1878. Latitude, own observations of zenith- 

 stars with meridian circle. 



Director: C. Borgen, Dr. ^7w7., 1876 j 



Assistants : P. Andries, Dr. phil. ; 



Lieutenant zur See, Hartmann. 



Founded in 1875 ; completed in 1878. 

 Instruments : 



{a) Meridian circle: one; makers, A. Eepsold Sohne, in Hamburg; 

 diameter of circles, 21.6 inches, divided to 2'; read by 4 microscopes, 

 each to 0".l; aperture of objective^ 4 J inches; magnifying jjower ordi- 

 narily employed, 125 diameters. 



(6) Meridian transit instruments : one portable, by 0. Bamberg, Ber- 

 lin ; aperture, 1^ inches. 



(c) Dquatorial instruments: one, by Steinheil Sohne, in Munich; 

 aperture of objective, 4 inches; magnifying i^owers of eye-pieces, 48 to 

 360; ring-micrometer, (c') One, Steinheil Sohne; 2 J inches aper- 

 ture; magnifying power, 24 to 150. 



(/) Chronograph : one, by FuESS, Berlin. 



(g) ClocTcs; meantime; one, by Eppner, Berlin; sidereal; one, by F. 

 TiEDE, Berlin (standard clock). 



(i) Miscellaneous; A comi^lete set of Lamont's instruments for ob- 

 serving the variations of the magnetical declination, horizontal force, 

 and inclination. 



Lamont's magnetical theodolite; dip-circle by Dover; self-register- 

 ing barometer and anemometer (Eobinson); meteorological instru- 

 ments; self registering tide-gauge; time-ball. Since September, 1880, 

 a self-registering tide-gauge, devised by Mr. Reitz, of Hamburg, has 

 been erected in Heligoland and placed under the control of this Observ- 

 atory. 



Observations durin'g the past tear (1880): 



(a) Observations for time and determination of places of the occulta- 

 tion-stars of the ISTautical Almanac. 



(b) Only used for i)ractical instruction, 



(c) (c') Comet Swift (1880 c). Occultations of stars. 



(?') Meteorological observations (three times a day, usual weather re- 

 cording and registering of barometer and anemometer, read hourly), 

 magnetical observations; every second hour from 8 a. m. to 10 p. m. 

 readings of the variation instruments, and every month one or two ab- 

 solute determinations of magnetic elements. Tide registerings here and 

 in Heligoland. 



