ASTRONOMICAL OBSERVATORIES. 377 



Dubuque, Iowa. 

 Duhvqiic Observatory. 



Loiigitiulc from TTasliingtou, 54'" 27.01" W. 

 Latitude, 42^ 29' 38" N. 



Authority for longitude and latitude: Boundary line between the 

 States of Illinois and Wisconsin, projected tlirougii the city of 

 Dubuque; and telegraphic record of star transits at Ann 

 Arbor and Dubuque. 

 Director: AsA IIORR, M. D. Under the supervision of Prof. J. C. 

 Watson, in 18G5. 

 Instruments : 

 {b) Meridian transit instrument: Maker, Wm. Wiirdem Ann, Wash- 

 ington, D. 0. Aperture, li inches; magnifying i)o\ver sufficient to note 

 time by stars of the 10th magnitude. Finding circle, 4i inches diam- 

 eter, reading by verniers and lenses to half a minute of arc. The pier 

 extends 17 feet into the ground, through clay to gravel ; it is 7 feet 6 

 inches 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 space 

 between (at the surface of the ground) being stuffed with oakum. The 

 Y's rest on thin brass supports on the top of stone pillars, instead of the 

 iron frame which acme with the instrument. 



{g) Clock: Mean time; makers, Howard & Co., Boston. Tower 

 clock, reliable to less than a second a day througli all extremes of tem- 

 perature. 



(/i) Glironometer : Mean time; maker, K. Zimmerman, Liverpool, Eng- 

 land. 



Due West, South Carolina. 



Astronomical Observatory of Ersldne College. 



Longitude from Washington, . 



Latitude, . 



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



Easton, Pennsylvania. 



La Fayette College Observatory. 



Longitude from Greenwich, . 



Latitude, . 



Director: . 



Elizabeth, New Jersey. 



Observatory. 



Longitude from Washington, 11'" 22.2^ E. 



Latitude, 40^ 40' 19" N. 



Authority for latitude and longitude : United States Coast Survey. 



Director: Charles W. Plyer. 



