G50 EEPOETS OF ASTEONOMICAL OBSEKVATOEIES. 



New Haven, New Haven County, Connecticut. 

 Winchester Observatory of Yale College. 



Longitude -from Washiugton, O'^ 16°^ SOM E. 



Latitude, 41° 18' 3C".5 N. 



Authority for latitude: Zenith-telescope observations in 1857-'58. 

 See Am. Jour, of Sci., vol. 30, ]). 52. Second series. (Coast Survey lati- 

 tude 41°^ 18' 40".67.) 



Authority for longitude : United States Coast Survey. 



President of hoard of managers : C. S. Lyman. 



Astronomer in charge of horological bureau : Dr. Leonard Waldo. 



Assistant astronomer : William Beebee. 



Founded in 1830. Several instruments were presented by Messrs. 

 Sheldon and W. Hillhouse. 



Directors; E. LooMis, 1831 ; 



D. Olmstead, 1836 ; 

 C. S. Lyman, 1847. 

 Instruments : 



(a) Meridian circle : makers, Ertel & Sons, 1845. Formerly the 

 property of the U. S. Naval Observatory. Altered by William J. 

 Young, 1855, and regraduated 1876. Diameter of circles, 40 inches; 

 divided to 2' ; read by six microscopes to 1" ; aperture of objective, 3.8 

 inches; for observations of the sun, aperture emi)loyed, 1.7 inches; 

 magnifying power ordinarily employed, 190 diameters ; focal length, 

 58.2 inches. 



(b) Meridian transit instruments : one made by C. S. Lyman, of 36-inch 

 focal length ; aperture, 2.6 inches ; magnifying power, 185 diameters. 

 Circle, 12 inches, reading to 10" by verniers; it has declination microm- 

 eter and fine level, for use as zenith telescope, made in 1852-'53 : one 

 by T«ouGHTON & SiMJVis, London ; aperture, 3.99 inches ; magnifying 

 power, 150-200 diameters; focal length, 5.108 feet, {b') Combined 

 transit and zenith telescope, of 36-inch focal length ; aperture, 2.6 inches; 

 power, 185 diameters; 12-inch circle, reading to 10" by verniers; decli- 

 nation micrometer and sensitive level for latitude work ; made in 1852-'56 : 

 object-glass by Fitz, design and mounting by C. S. Lyman. 



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

 ture of objective, 9 inches ; magnifying powers of eye-pieces, 40, 80, 140, 

 200, 280, 450, 620. (c') Portable 4§-inch refractor by Messrs. Clark «fe 

 Sons. 



{d) Spectroscope: by A. Clark & Sons, of 7 prisms twice traversed. 



(/) Chronographs : one by A. Clark & Sons, with conical pendulum 

 governor; another by William Bond & Son, Boston, with Bond's 

 spring governor. 



(g) ClocJcs: one mean time; made by E. Howard & Co., Boston; 

 one by William Hillhouse, New Haven : one sidereal; by William 

 Bond & Son, Boston; one by Appleton, London; one by E. How- 

 ard & Co. 



