54 



Determination of the Difference of Longitude between Chicago and 

 Toledo^ Ohio, by electric signals for comparisons of time, August 

 13th, 185«. 



Sidereal Chronometer No. 2557, fast, of Toledo, sidereal time, (at 

 20^. 49m. sidereal time,) 4:Sm. 15s.30. 



Rate per sidereal day, + 55.62; or per sidereal hour, + Os.234. 



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

 time, (at 11//. 0.*3m. mean time,) 4m. 286'.5. 



Rate per mean solar day, — O5.I8T; or per mean solar hour, — 

 05.0078. 



1st. — Chicago signals recorded at both stations. 



1st Mean. — Electric signals sent from Chicago to Toledo, Ohio, 16 21.642 



2d. — Toledo siiinals recorded at both stations. 



2d Mean. — Electric signals sent from Toledo, Ohio, to Chicago, 16 21.618 

 Ist Mean. — Electric signals sent from Chicago to Toledo, Ohio, 



as above, --------- 16 21.642 



Result: — Toledo OI).serving Station is east, in longitude of Chi- 

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

 signals, — () 16 



:i.63 



