REPORTS OF AMERICAN OBSERVATORIES. 551 



(d) Spectroscopes : Large 9 prism Clark spectroscope; seven prism, 

 double acting (equivalent to 13 prisms), fitting equatorial mentioned 

 above. 



(/') Chronographs: Bond's Spring Governor. 



(</) Clocks: Meantime; makers, Utzsciineider & Frauenhofer, 

 connected with chronograph; Sidereal, makers, Utzschneider & 

 Mahler, of Munich, connected with chronograph. 



(?) Miscellaneous ; Comet seeker, aperture 3.0 inches, mounted on large 

 tripod ; small portable telescope, aperture 3 inches; zenith sector, loaned 

 by Coast Survey, aperture 4 inches ; full set of common meteorological 

 apparatus, including a recording barometer; sextant by Hardy, of 

 London. 



III. Observations during the past year. 

 (a) For time and latitude. 



(d) Class illustration on reversal of lines, and for prominences. 

 (?) Meteorological observations 3 times per day ; sun spot observations 

 sinee September 1, 1879. 



IV. Work proposed for the coming year: (1880.) 

 Similar work, with special attention to sun spots, prominence, &c, 



and spectroscopic observations. 



Location of observatory : Hastings; (County) Westchester; (State) New 

 York. 



Name of observatory : Henry Draper's Observatory, 



Longitude from Greenwich, 73° 52' 25" west. 

 Latitude, 40° 59' 25". 

 Authority for latitude and longitude : United States Coast Survey. 



I. Personnel: 

 Director, Dr. H. Draper. 

 Assistant, Mrs. DRAPER. 



II. Instruments: 



(b) Meridian transit instruments ; Makers, Stackpole Bros. ; aperture, 

 2 inches; magnifying power, 25 diameters. 



(c) Equatorial instruments: 28-inch silvered glass reflector by H. 

 DRAPER; L2-inch achromatic by Alvan Clark. 



(?/) Spectroscopes: Crating spectroscope for solar work- by Alvan 

 Clark;; stellar spectroscope by Browning; stellar photographic spec- 

 troscope by H. Draper; largo spectroscope for research on oxygen in 

 l he Sun. 



(/) Chronograph : by n. Draper. 



(/?) Chronometers: Mean time, makers, Negus Brothers; sidereal, 

 makers, Negus BROTHERS, break circuit. 



(i) Miscellaneous: Silvered glass altazimuth 15^ inches aperture; 



