69 



Is^ Result — Chronometer No. 2557, 

 fast (at loA. 40m.) 



h. m. s. 



1 51 04.10 h. m, s. 

 + 1 51 04.10 



2d Set. After the Signals, 

 By 14 observations on e Bootis, west 



(at 18^. 03m.) - - - 1. 51 04.47 



By 10 observations on C" Cygni, east 



(at 18A. 23m.) - - - 1 51 04.49 



2d iJeswZi— Chronometer No. 2557, 



fast (at 18^. 13m.) - - 15104.48 



Result adopted — Chronometer No. 2557, fast of si- 

 dereal lime for this station (at 16A. 56m.) 



+ 1 51 04.48 



1 51 04.29 



The above result, and the results of the time-observations at Chicago 

 of the 22d and 24th of June, api lied to the telegraphic signals, give 

 us a second determination of the longitude of our Fulton Station, as 

 follows, viz. — 



Determination of the Difference of Longitude between Chicago and 

 Fulton, Illinois^ by electric signals for comparisons of time, June 

 23c?, 1859. 



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

 16A. 29m. 23s. sidereal time), 1^. 51m. 04s.l6. 



Rate per sidereal day, + 7s.025; or per sidereal hour, + Os.2927. 



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

 time (at lO/z. 32m. 20s. mean lime) 4?^. 50s.03. 



Rate per mean solar day, — 0s.l9; or per mean solar hour, — 

 Os.0079. 



1st. — Chicago signals recorded at both stations. 



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



10 08.74 



