REPORTS OF AMERICAN OBSERVATORIES. 557 



V. Principal publications of the Observatory during 

 the year 1879: 



1. S. P. Langley, on certain remarkable groups in lower spectrum, 

 in Proceedings of American Academy. 



2. S. P. Langley, on comparison of sun, in Proceedings of American 

 Academy. 



3. S. P. Langley, on Bessemer converter, in Proceedings of Ameri- 

 can Academy. 



4. S. P. Langley, on electric time service, in Journal of Electrical 

 Society. 



Location of observatory : (City) Annapolis; (County) Anne Arundel ; 

 (State) Maryland. 

 Xame of observatory : U. S. Naval Academy Observatory. 

 Longitude from Washington, E. h 2 m 15 3 .91. 

 Latitude X. 3S° 58' 53".5 



Authority for latitude and longitude: latitude, Professor Chauve- 

 net ; longitude, United States Coast Survey. 



I. Personnel: 



Lieutenant Commander Allan D. Brown, U. S. N., head of Depart- 

 ment Astronomy, Navigation, etc. 

 Assistants: 1. Lieutenant Commander Chas. J. Train, Instructor 

 Astronomy, Navigation, etc. 



2. Lieut. Eaymond P. Eodgees, Instructor Astronomy, 

 Navigation, etc. 



3. Lieut. Wi. J. Barnette, Instructor Astronomy, Navi- 

 gation, etc. 



IT. Instruments: 



(a) Meridian circles: 1; maker, Repsold; diameter of circles, 28.7 

 inches; divided to L"; read by four microscropes to 2". Aperture of 

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

 inches; magnifying power ordinarily employed, about 200 diameters. 



(c) Equatorial instruments : Makers, Alvan Clark &Sons; aperture 

 of objective, 7.75 inches; magnifying powers of eye-pieces, 40, 106, 553, 

 966; micrometer eye-pieces 89, 220, 073. 



(/) Chronographs; One Morse fillet ; one Transit of Venus Commis- 

 sion. 



(y) Clocks: One sidereal; makers, Arnold, Chas. Frodsham, 84 

 Strand, London. 



(h) Chronometers: Meantime; makers, Negus, Nos. 1030,1088,1260; 

 Dent 2099; EATTON, 262. Sidereal; maker, Negus, Nos. L520, 1527. 



(i) Miscellaneous: One Talcott's zenith telescope (Wurdemann) ; one 

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

 mann). 



