652 REPORTS OF ASTRONOMICAL OBSERVATORIES. 



Instruments : 



(c) Equatorial instrument: Makers, A. Clark &c Sons; aperture of 

 object] ve, 9.4 inches ; magnifying powers of eye-pieces, various up to 

 2,000. 



{(j) Clock: Mean time; Swiss regulator, seconds. 

 VI. Additional information: 



This Observatory^ consists of a small frame building, witli dome 12 

 feet G inches diameter, upon the grounds of tbe owner, covering an 

 equatorial telescope. The latter rests uj)on a granite pedestal, Aveigh- 

 ing about 1,500 pounds. The mounting is by Young, of Philadelphia, 

 and is of the best workmanship. The declination circle is 13 inches in 

 diameter, reading by verniers to 10 seconds of arc. The hour circle is 

 10 inches diameter, reading by verniers to 4 seconds of time. The 

 graduations are upon silver. The object-glass, tube, and finder are by 

 A. Clark «& Sons. The aperture of the object-glass is 9.4 inches, with 

 a focal length of 121 inche.^^ , and is without doubt the finest specimen 

 of the skill of Mr. Alvan Clark. Under the most rigid tests, its 

 figure is found to approach very closely to absolute perfection. It is 

 shown also by the vision it gives of the closest double stars and the 

 faintest companions to bright stars hitherto discovered. Among the 

 former, y"^ A^iclromedw, X Cassiopece^ and rj Coroncc in its present position 

 may be mentioned, and of the latter class, the comi^anions to ;' Lyra', 

 Z Aquillce, £ and p Hydrw, the star closely following the attendant to 

 Regidus, and under very favorable circumstances the 2" companion to 

 e Coronm. The instrument has been used for general observations of 

 the stars, moon, and planets, other occupations preventing the owner 

 from carrying on at present any more regular work. 



New Windsor, Mercer County^ Illinois. 

 Observatory. 



Longitude from Washington, 53™ 40^ W., approximately. 



Latitude, 41° 13' K, approximately. 



Authorities for latitude and longitude : Director's own observation, 

 and from longitude of government arsenal at Eock Island, 111. 



Director: Edgar L. Larkin. 



Permanent Observatory, brick pier, and revolving dome. 

 Instruments : 



(c) Equatorial instrument: makers, Alvan Clark &, Sons; aper- 

 ture of objective, G inches ; magnilying powers of eye-pieces, 27, GO, 130, 

 250, 300, GOO, with prism and solar eye-piece. Two of the eye-pieces are 

 GuNDLAcn's periscopic. 



{(j) Clock: sidereal; ordinary clock. 



{i) Miscellaneous: Planisphere, charts, maps, and catalogues, 



