ASTRONOMICAL OBSERVATORIES.

401

University of Virginia .

Leander McCormick Observatory .

Longitude from Washington , 5 m 53.13 s W.

Latitude, 38° 2' 1.2" N.

Director : Ormond Stone .

Washington , District of Columbia .

United States Naval Observatory

Longitude from Greenwich, 5 h 8 m 12.09 s W.

Latitude, 38° 53' 38.8" N.

Directors : M. F. MAURY , 1841.

James M. Gilliss , 1861,

Charles H. Davis , 1865.

Benjamin F. Sands , 1867.

John Rodgers, 1874.

Stephen C. Rowan, 1882.

Robert W. Shufeldt , 1883.

Samuel R. Franklin, 1884.

George E. Belknap , 1885.

Allan D. Brown, 1886.

Robert L. Piiythian, 1886.

Created by the Navy Department in 1833.

Instruments :

(a) Meridian circles: 1; makers, Pistor & Martins ; diameter ofcircles, 43.40 inches; divided to 2'; read by 4 microscopes to 0".l;aperture of objective, 8.52 inches; for observations of the sun, apertureemployed, 3 inches; magnifying power ordinarily employed, 186 diam-eters.

(b) Meridian transit instruments: Makers, Ertel & Son, aperture5.33 inches; magnifying powers 85, 86, 106, 118, 162.

• ( b ') Eight portable transits and zenith telescopes combined, used onTransit of Venus Expeditions. '

(e) Equatorial instruments: Makers, Alvan Clark & Sons; apertureof objective, 26 inches; magnifying powers of eye pieces, 176 to 1800.(c') MadebyMERZ: 9.62 inches aperture; powers, 90-900.

(c") Eight 5-inch equatorials by Alvan Clark & Sons, used onTransit of Venus Expeditions.

(e) Photometers : One nebula-photometer (Hastings’ pattern) for usewith the 26-inch equatorial.

(/j Chronographs: Some 10 or 12 in all, of various kinds.

(g) 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.

11. Mis. 170-26