(526 REPORTS OF ASTRONOMICAL OBSERVATORIES. 



Ann Aebor, Michigan. 



Detroit Observatory. 



Longitude from Watshingtou, 26°^ 43M W. 

 Latitude, 42° 16' 48". K. 

 Directors : F. BRtJNNOW, 1S54 ; 

 J. 0. Watson, 1858; 

 M. W. Haerington, 1879. 

 Annex of the University of Micliigan. Projected in 1852, commenced 

 in 1853, completed in 1854. The ])rincipal structure is surmounted by a 

 dome and has two -svings. About thirty i)lanetoids have been discov- 

 ered there. 



Annapolis, Anne Arundel County^ Maryland. 

 U. S. Naval Academy Observatory. 



Longitude from Washington, 2™ 15^61 E. 



Latitude, 38° 58' 53".48 N. 



Authority for latitude, Professor Chauvenet 5 for longitude, United 

 States Coast Survey. 



Director: Lieut. Commander P. F. Harrington, head of department 

 of Astronomy, Navigation, and Surveying. 



Assistants : 1. Lieut. Commander C. J. Train, U. S. Navy ; 



2. Lieut. Commander E. P. Eodgees, U. S. Navy ; 



3. Lieut. W. J. Barnette, U. S. Navy. 



INSTRUMENTS: 



[a) ATeridian circle: one; makers, Eepsold, Germany; diameter of 

 circles, 30 inches ; divided to 2' ; read by 4 microscopes to 2". Aperture 

 of objective, 4 inches ; for observations of the sun, aperture emjiloyed, 

 — inches ; magnifying power ordinarily employed, 80 diameters. 



{b) Meridian transit instriiment: maker, WIjrdemann; aperture, 2 

 inches ; magnifying i)Ower, 40 diameters. 



(c) Equatorial instrument : makers, Al VAN Clark & Sons ; aperture 

 of objective, 1% inches; magnifying power of eye-pieces, 40, 106, 553, 

 and W)(\ ; micrometer eye-pieces, 89, 226, 673. 



(/) Chronographs: one Morse fillet; one Transit of Yenus Commis- 

 sion. 



(g) Cloclc : one sidereal; makers, Arnold, Chas. Frodsham, London. 



(//) Chronometers: five, mean time; makers, Negtjs, Nos. 1030, 1088, 

 1260; Dent, 2099; Hatton, 262: two sidereal; maker, Negus, Nos. 

 1520, 1527. 



{i) Miscellaneous : one Talcott's zenith telescope ( WDrdemann) ; one 

 Transit of Venus telescope (Stackpole); portable transit (Wurde- 

 mann). 



The officers attached to the observatory are not practical astronomers, 



