544 REPORTS OF AMERICAN OBSERVATORIES. 



Y. Principal publications of the observatory during 



THE YEAR: 



1. E. C. Pickering, annual report, 1878; published in 1879, vol. 1, 

 page 14. 



VI. Additional information: 



Two volumes of the annals of the observatory are in course of publi- 

 cation. 



The financial condition of the observatory has been greatly improved 

 by the completion of a subscription to provide for its current expenses. 

 This will be of important service in the reduction of a large accumula- 

 tion of observations, the publication of which must otherwise have been 

 long delayed. 



A room lias been fitted up for the purpose of making accurate meas- 

 ures of distance and comparisons of scales. 



Location of observatory : (City) Chicago; (County) Cook ; (State) Illi- 

 nois. 

 Name of observatory : Dearborn University Observatory. 

 Longitude from Washington, + h 42 m 14 8 .26. 

 Latitude, + 41° 50' 01".0. 

 Authority for latitude and longitude : American Ephem. and Naut. 

 Almanac. 



I. Personnel: 

 Director, G. W. HOUGH. 



II. Instruments : 



(a) Meridian circles: Makers, Eepsold & Son; diameter of circle, 

 40 inches; divided to 2'; read by 4 microscopes to 0".l ; aperture of 

 objective, inches; for observations of the sun, aperture employed, 3 

 inches. 



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

 ture of objective, 18£ inches; magnifying powers of eyepieces, positive, 

 120, 190, 287, 385, 900 ; negative, 135^ 225, 450, 900. 



(/) Chronographs: G-. W. Hough; cylinder recording. 



(g) Clods: Mean time; Makers, Howard & Co.; Graham escape- 

 ment, mercury pendulum. Sidereal ; Makers, Charles Gortner & 

 Co., London; Graham escapement, mercury pendulum, 



(//) Chronometers: Sidereal; Makers, Bond & Son. 



(i) Miscellaneous : Signal mean time clock for transmitting time sig- 

 nals. 



III. Observations during the past year: 



From May 18 to . 



(a) The Dearborn Observatory is not at present in active operation for 

 waul of funds. Observations are, however, made by the director as far 

 as his time will permit. 



