63 



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

 2d. — Dunleith siirnals recorded at both stations. 



12 04.41 



2d Mean. — Electric signals sent from Dunleith to Chicago, 

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

 above, ___---- 



12 04.43 



12 04.41 



Result : Dunleith station No. 2, is west in longitude of Chicago 



station No. 3, by a mean of the two sets of signals, + 12 04.42 



Longitude of Chicago Station No. 3, - +5 50 31.20 



Defcrminaf'ion 2d. 

 Longitude of Dunleith observing station, west of the 

 meridian of Greenwich, by this 2d determination 

 of Feb. 22d, 1859, ... - 60235.62 



Determination Isf. 

 By the ob.servations and signals of February 21st, as 



above given, - - - - 6 02 35.88 



Resvlt adopted — Longitude of the Dunleith observing 

 station, west of the meridian of Greenwich, by a 

 mean of the two determinations, - . 6 02 35.75 



Equal, in arc, to ... 90^ 38' 56".25 



Latitude of this station, as before given, - 42"^ 29' 44". 9 N. 



