26 



The apparent Right Ascensions and Declinations of the stars ob- 

 served on, were taken from the British Nautical Almanac, except a 

 few whose apparent places are not given in that Ephemeris. The 

 exceptions are as follows, in relation to which the apparent places 

 were taken from the Connaissance des Temps, namely: 

 /3 Andromedce 

 e Herculis 

 Q Cygni 

 y Cygni 



For the determination of the lon<i;itudes, now reported, two meridians 

 of comparison were used, namely : — I. Chicago. IX. '['oledo, Ohio, 

 after its longitude was derived from chronometric compiirisons, by 

 means of the electric telegraph, with the meridian of Chicago. 



The time-ohservations at Chicago, and the observations both for 

 the time and the latitude at those stations whose longitudes are based 

 upon direct connections with the meridian of Chicago, will first be 

 given. Then the same will be done in regard to the time-ohserva- 

 tions at Toledo, and the observations at those stations whose longi- 

 tudes are derived from direct connections with the meridian of Toledo. 



Finally, the observations will be given that were made for verifying 

 the positions of Michigan City, Indiana, and Madison, the Capital of 

 Wisconsin. 



The position of the observing station at Chicago, will be shown by 

 reference to the table at page 351 of Vol. VI. of the Society's Pro- 

 ceedings. 



Observations for the Time at Chicago. 

 \st. 185S, July 2dth. At Chicago Observing Station No. .3, in 

 latitude 41° 53' 46".3 iV. ; longitude bh. 50m. 31s.2 W. of 

 Greenwich. 

 Siderial chronometer No. 2557, fast: 

 By 17 observations on a, Coronce Borealis, west (at h. m. s. 



19/j. 22m. sidereal) - - - - 1 02 50.25 



By 23 observations on oc Andromedse, east (at 20/t. 



Oym. sidereal) - - - - 1 02 50.63 



Result — Chronometer No. 2557, fast of sidereal time 



for this station (at 19/t. 45m. sidereal) - + 1 02 50.44 



By comparison — Chronometer No. 141, was slow of 

 mean solar time for this station (at \\h. 26m. 

 mean time) - - - . — 4 38.17 



