363 



II. MICHIGAN CITY, INDIANA. 



The station occupied was on the summit of a sand hill, about 350 

 yards north-easterly from the rail road depot. A connection will be 

 made by survey, as soon as convenient, between the observing sta- 

 tion and one of the church steeples, and will be reported. 



1st. Observations f 07' the Latitude. 1858, June 21st. 



By 10 observed circum-meridian altitudes of j3 Librne, 

 south, combined with 5 observed altitudes of Po- 

 laris (« Ursse Minoris), north; latitude (approxi- 

 mate) - - - - - 41° 43' 25" 



2c?. Observations for the Time. Same Night. 



Sidereal chronometer No. 2557, fast: m. s. 



By 13 observations on u. Lyra^, cast (at 15//. 3Gm.) 56 31.4 



By 14 observations on u Bootis, west (at 16h. 08m.) 56 SO'.S 



Result — Sidereal chronometer No. 2557, fast of side- 

 real time for this station (at 15/t. 52m.) - - -f 56 30.95 



od. The Longitude. 



This was determined the same night by chronometrlcal connec- 

 tions with the meridian of Chicago, by means of electric signals trans- 

 milted each way by the telegraph wires. The times at the two sta- 

 tions were derived from the above observations made this night at 

 Michigan city, and the observations made at Chicago on the nights 

 of the 20th and 22d inst. above given, which also determine the rates 

 of the two chronometers for reduction to the times of the signals. 



The whole operation is shown as follows, viz. — 



