ASTRONOMY. 85 



Another Equatorial, 0M5 m (=5.91 inches) aperture, is employed for 

 spectroscopic work. Drawings of Mars were made with it by M. L. 

 Niesten. 



The new instruments, when installed, will be devoted to three prin- 

 cipal objects : first, to double-star observations of binaries and proper- 

 motion stars ; second, to observations of Jupiter s satellites in transit ; 

 third, to spectroscopic observations, particularly of binaries. The 

 sun is now observed spectroscopically by M. Fievez. 



Diisseldorf Observatory. 



Dr. Robert Luther, Director. 



In 1877 thirty-seven Ring-micrometer observations of fourteen plan- 

 ets were made. Since 1847 there have been made 856 observations 

 of 103 planets. 



Private Observatory of Dr. Eppsteiu, Frankfort -on -the -Main. 



The principal instrument is a Newtonian Reflector of 6.3 inches 

 aperture, made by Browning, costing 26. The minimum xisibile 

 Is an 11.12 magnitude star. 



The work undertaken with the instrument is a continuation of 

 HerscheVs sweeps. The field of view of the sweeping eye-piece is 

 30', and two hundred fields have been swept and 6700 stars counted 

 (1877 September, October, and November). 



(xotha Observatory. 



Dr. A. Kruger, Director. 



During the necessary repairs of the Meridian Circle (0.075 m aperture, 

 1.160 m focus), the Helsingfors University has lent its Transit Instru- 

 ment to Dr. Kruger, and this has been used for zone observations 

 (zone +55 to +65). 



Private Observatory of Herr Yon Konkoly, O'Gyalla, near Komorn. 



This observatory has three domes, a Meridian room, and a chem- 

 ical laboratory. 



The instruments are : a Browning Reflector, 10^ inches aperture, 

 7 feet focus; a Merz Refractor, 6 inches aperture, 6 feet focus; a small 

 Telescope, 3 inches aperture, for sun-spot observations; a Starke Me- 

 ridian Circle, about 3 inches aperture, circles reading to 1" ; two 

 Comet- seel'ei's and minor instruments, and several Spectroscopes ; a 

 Zollner's Pliotometer. 



The work of 1876-77 has been the formation of a catalogue of one 

 hundred and sixty stars (l rn -6 m ) whose spectra have been observed. 

 Dr. Schrader is assistant, and has conducted a regular series of sun- 

 spot observations. 



