REPORTS OF ASTRONOMICAL OF.SEKVATOKTES. 050 



rROViDENCE, Providence Connti/, Iihodc Island. 



Seagrave Observatori/. 



Longitude Iroin Wasliiugton, 22™ ?>'i^.~)l E. 

 Latitude, 41° 49' 4G".40 N. 



Authority for latitude and lougitude: United States Coast Survey 

 and ourselves, F. E. Seagraye and Leonard ^YALDO. 

 Director: V. E. Seagrave. 



Instru3*ients : 



(c) Equatorial instrument : one equatorial; makers, Alyan Clakk & 

 Sons; aperture of objective, 8^ inches; magnifying powers of eye- 

 pieces, 93, 121, 184, 311, 571; negatives, 518, 11(3, 230, 335, 375; positive 

 eye-piecesr achromatic, 248. 



[d) Spectroscope: one by Broavning, Mhicli consists of 4 wliole ami 2 

 half prisms of 00°; flint ghiss; gives a dispersive power of ten i)risuis 

 by reflection. 



Chronometer: sidereal; maker, Victor Kullberg, London. 



Observations during the past year (from June 20, issn, to 

 December 31, 1880) : 



1. Observations of 01 Cyfjni from June 20, 1880, to December 31, 1880, 

 for the purpose of determining the amount of its proper motion. 



2. Observations of a few of Burnuam's double stars. 



3. A few observations of the position angles and distances of the 

 satellites of Saturn. 



Work proposed for the co:virNG year (1881): 

 It is proposed this year to select some star in the northern hemisphere 

 (as near the pole as possible) that has a large proper motion, and select 

 two or three smaller stars that are in the same field of vision, and meas- 

 ure the distance and position angles of them from the large star, for tin- 

 purpose of determining the amount of proper motion, and possibly its 

 paralhix. 



Additional information: 

 It is also intended to observe the satellites of Saturn during the next 

 opposition, and measure the distances and position angles of the small 

 stars next Mars during the opposition of December, 1881. 



Riverdale, Xew Tori: Cotinty, J\"eic York. 



Longitude from Washington — 



Latitude — , ^ ., z^, 4 „ 



Not yet determined, owing to the recent removal of the Observatory 



from Fordham to Biverdale. 

 Director ; Wllliam JMeikleham. 



