117 



2d Mean. — Electric signals sent from Madison to CMcago, 

 1st Mean. — Electric signals sent from Chicago to Madison, 

 as above, ------- 



07 02.38 



07 02.37 



Result: — Madison Observing Station is west, in longitude, of 

 Chicago observing Station No. 3, by a mean of the two sets 

 of signals, -..-.. +00702.375 



Reduction to the dome of the State Capital, 



— 0.23 



Dome of the State Capital at Madison, west, in longi- 

 tude, of Chicago Station No. 3, - + 07 02.14 



-f 5 50 31.20 



Lonoritude of Chicago Station No. 3 



^st Determination. 

 Longitudeof the dome of the State Capital at Madison, + 5 57 33.34 



We also observed for the time at Madison, about midnight of June 

 5th, 1859, and afterwards exchanged telegraphic signals with Chicago, 

 which gave us another comparison with the meridian of Chicago for 

 the longitude of this station, as follows, viz. — 



Observations for the Time. At Madison Station No. 2. 

 1859, June 5th. 

 Sidereal chronometer No. 2557, fast: 

 By 7 observations on cc Canum Venaticorum, west 



(at 16/j. 38m.) - - - + 1 45 46.99 



By 7 observations on x Cygni, east (at 16h. 56m.) + 1 45 47.48 

 Result — Chronometer No. 2557, fast of sidereal time 



for this station (at 16/i. 47m. - - . _[_ i 45 47.23 



A comparison of this result with the last mentioned Chicago time- 

 observations, by means of the following signals, which were exchanged 



