REPORTS OF ASTRONOMICAL OBSERVATORIES. 050 



Providence, Providence County, Rhode Zsland. 



Seagrave Observatory. 



Longitude from Wasliinoton, f}2'" .'M^,")! p]. 

 Latitude, 41° 49' 4G''.40 X. 



Authority for latitude and longitude: United States Coast Survey 

 and ourselves, F. E, Seageave and Leonard Waldo. 

 director: F. E. Seaqrave. 



Instruments : 

 (c) Equatorial mstrument: one equatorial; makers, Alv AN Clark & 

 So:>s; aperture of objective, 8^ inches; magnifying powers of eye- 

 pieces, 93, 121, 184, 311, 571; negatives, 518, 110, 230, 335, 375; positive 

 eye-pieces achromatic, 248. 



{d) Spectroscope: one by Browning, which consists of 4 whole and 2 

 half prisms of 0(P; flint glass; gives a dispersive power of ten i)risms 

 by reflection. 



Chronometer: sidereal; maker, Victor Kullberg, London. 



Observations during the past year (from June 20, 1880, to 

 December 31, 1880) : 



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

 for the purpose of determining the amount of its ])roper motion. 



2. Observations of a few of Burnham's doable stars. 



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

 satellites of Saturn. 



Work proposed for the coming year (1881): 

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

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

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

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

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

 parallax. 



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. 



EiVERDALE, New Yorlc County, Xeio York. 



Longitude from Washington — 



Latitude — 



Xot yet determined, owing to the recent removal of the Observatory 



from Fordham to Eiverdale. 

 Director ; William jVIeikleham. 



