89 



The Longitude. 

 The above result for the New Buffiilo time, and the observations 

 of the 22(1 and 24th of May, for the Chicago time, combined witli ihe 

 following telegraphic signals, give us a third result for the longitude, 

 as follows, viz. — 



Deiermination of the Difference of Longitude between Chicago and 

 New Buffalo, Michigan, by electric signals for compariaons of 

 time, May 2'Sd, 1859. 



Sidereal Chronometer No. 2557, last, of New Buffalo sidereal time 

 (at 15/j. 11m. 27s. sidereal time), 1^. 33m. 34s.71. 



Rate per sidereal day, -f 7s.351 ; or per sidereal hour, + 05.3063. 



Mean solar Chronometer No. 141, slow, of Chicago, mean solar 

 time (at 11 A. 02m. 52s. mean lime), 4m. 41s. 76. 



Rate per mean solar day, + 0s.02764; or per mean solar hour, 

 + Os.00115. 



1st. — Chicago signals recorded at both stations. 



1st Mean.— Electric signals sent from Chicago to New Buffalo, 03 31.908 

 2d. — New Buffalo signals recorded at both stations. 



2d Mean. — Electric signals sent from New Buffalo to Chicago, 03 31.88 

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



as above, - - - - - - - 03 31.908 



Result: — New Buffalo Observing Station is east, in longitude, 



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

 sets of signals, - - - - - — 03 31.894 



VOL. VII. M 



