48 



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

 dereal time lor this station (at 22h. 34m. of Aug. 

 6th, sidereal) - - - 



-f o 34.56 



3<Z. For the Longitude. 



The above result, for the Ashtabula time, compared with the time- 

 observations at Chicago, of the 4th and 12th of August, to obtain the 

 rate of mean solar chronometer No. 141, and applied to the following 

 telegraphic signals, gives the difference of longitude between those two 

 places, and the longitude of Ashtabula west of the meridian of Green- 

 wich, as follows, viz: — 



The rate of the sidereal chronometer, from the period of its determi- 

 nation this night, back to the period of each signal, is deduced, in 

 this instance, from the two sets of time-observations made this night. 

 The great elapsed time here, being 4/<. 39/^., seemed to justify this. 



Determination of the difference of Longitude between Chicago and 

 Ashtabula, Ohio, by electric signals for comparisons of time, 

 August 6th, 1858. 



Sidereal Chronometer No. 2557, fast, of Ashtabula, sidereal time, 

 (at 21/?. I8?n. sidereal time,) S6m. 34.{)4s. 



Rate per sidereal day, -}- 3s.00; or per sidereal hour, + 0s.l25. 



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

 time, (at llA. 49m. mean time,) 4m. 31s.02. 



Rate per mean solar day, -f- Os.455; or per mean solar hour, + 

 05.01896. 



1st. — Chicao-o signals recorded at both stations. 



1st Mean. — Electric signals sent from Chicago to Ashtabula 27 21.422 



