ASTRONOMICAL OBSERVATORIES.

377

Dubuque , Iowa .

Dubuque Observatory.

Longitude from Washington , 54 m 27.61 s W. Latitude

, 42° 29' 38" hi.

Authority for longitude and latitude: Boundary line between theStates of Illinois and Wisconsin , projected through the city ofDubuque ; and telegraphic record of star transits at Ann Arbor and Dubuque .

Director: Asa Horr, M. D. Under the supervision of Prof. J. 0.Watson, in 1865.

Instruments :

(b) Meridian transit instrument: Maker, Wi . Wurdemann, Wash­ ington , D. 0. Aperture, 1J inches; magnifying power sufficient to notetime by stars of the 10th magnitude. Finding circle, 4J inches diam-eter, reading by verniers and lenses to half a minute of arc. The pierextends 17 feet into the ground, through clay to gravel; it is 7 feet 6inches diameter at base, 3 feet at top, which is 4 feet above the surface;is surrounded by a brick wall, 8 inches from the stone shaft, the spacebetween (at the surface of the ground) being stuffed with oakum. TheY’s rest on thin brass supports on the top of stone pillars , instead of theiron frame which acme with the instrument.

(fir) Cloclc: Mean time; makers, Howard & Co., Boston . Towerclock, reliable to less than a second a day through all extremes of tem-perature.

(h) Chronometer: Meantime; maker, K.Zimmerman, Liverpool,Eng­ land.

Due West, South Carolina .

Astronomical Observatory of Frslcine College.

Longitude from Washington, -.

Latitude, -.

Director: Bev. W. M. Grier, D. D.

Easton , Pennsylvania .

La Fayette College Observatory.

Longitude from Greenwich,-.

Latitude, -.

Director: -.

Elizabeth, Hew Jersey.

Observatory.

Longitude from Washington , ll m 22.2 s E.

Latitude, 40° 40' 19" N.

Authority for latitude and longitude: United States Coast Survey.Director: Charles W. Plyer.