astronomical observatories. 401 



University of Virginia. 



Lcander McCormieJc Observatory. 



Longitude from "NVashingion, 5'" 53.13^ W. 

 Latitude, 3SO 2' 1.2" K 

 Director: Ormond Stone. 



Washington, District op Columbia. 



United States Naval Observatory 



Longitude from Greenwich, 5^ 8"^ 12.09* W. 

 Latitude, 38° 53' 38.8" N. 

 Directors : M. F. Maury, Idil. 



James M. Gilliss, 18G1. 



Charles H. Davis, 18G5. 



BEN.JAMIN F. Sands, 18G7. 



John Rodgers, 1874. 



Stephen C. Eowan, 1882. 



Egbert W. Siiufeldt, 1883. 



Samuel K. Franklin, 188-1. 



George E. Belknap, 1885. 



Allan D. Brown, 1886. 



Egbert L. Phythian, 18SG. 

 Created by the Navy Department in 1833. 



Instruments : 

 {a) Meridian circles : 1 ; makers, Pistor & Martins ; diameter of 

 circles, 43.40 inclies; divided to 2'; read hy 4 microscopes to 0".l ; 

 aperture of objective, 8.52 inches; for observations of the sun, aperture 

 employed, 3 inches; magnifying power ordinarily employed, 186 diam- 

 eters. 



(b) Meridian transit instruments: Makers, Brtel & Son, aperture 

 5.33 inches; magnifying powers 85, 86, 106, 118, 162. 



{b') Eight portable transits and zenith telescopes combined, used on 

 Transit of Venus Expeditions. 



(c) Equatorial instruments : Makers, Alvan Clark & Sons; aperture 

 of objective, 26 inches; magnifying powers of eye-pieces, 176 to 1800. 



{&) MadebyMERZ: 9.62 inches aperture ; powers, 90-900. 



{c") Eight 5-inch equatorials by Alvan Clark & Sons, used on 

 Transit of Venus Expeditions. 



(e) Photometers : One nebula-photometer (Hastings' pattern) for use 

 with the 26-inch equatorial. 



(T) Chronograplis : Some 10 or 12 in all, of various kinds. 



(</) Clocks : Mean time, 2 ; sidereal, 6. 



(h) Chronometers: Mean time, all the chronometers of the United 

 States Navy are kept here. Sidereal, eight, by Negus. 

 H. Mis. 170 26 



