56 



X. PRAIRIE DU CHIEN, WISCONSIN. 



Station. — This stailon is 122 feet due north from the front door of 

 the Telegraph Office at the depot of the Milwaukee and Mississippi 

 Rail Road, on the left bank of the Mississippi river. 



1st. Observations fo?' the Latitude. 1858, Ji/hj 12th. 



By 10 observed altitudes of c4 Ursee Minoris (Polaris,) 



nortli, combined with 24 circum-meridian altitudes ^ ^ ^, 



of /3 Aquarii, south; Latitude of station 43 02 01.35 N. 



The sky was so much clouded to the north, all night, that I could 

 obtain no more than ten observations on Polaris, and /3 Aquarii was 

 the only star that could be observed on, south, for the latitude. It 

 was only by watching the sky until an hour and a half past midnight, 

 that the above result could be obtained. Still later watching was 

 necessary, as will presently appear, to obtain the desired observations 

 for the time at this place. 



2d. Observations for the Time. Same night. 

 Sidereal chronometer No. 2557, fast: 



1st Set. 

 By 16 observations on a. Coronne Bo- h. m. s. 



realis, west(at 18/a. 07m.) - 1 15 39.18 



By 9 observations on cc Andromedse, 



east (at 20//. 43m.) - - 1 15 39.94 



1st Result — Chronometer No. 2557, 



fast (at 19A. 25m.) - - 1 15 39.56 h. m. s. 



+ 1 15 39.56 



2d Set. 



By 7 observations on a, Bootis (A retu- 

 rns) west (at 17/t. 39m.) - 115 39.60 



By 12 observations on a, Lyroc, also 



west (at 22/t. 05/7?.) . - 1 15 40.49 



Mean from 2 West Stars (at 1 9/i. 52?//.) 1 15 40.04 

 By 12 observations on u Cygni, east 



(at 17//. 10///.) - - 1 15 39.43 



