381 



Determination of the dijfercnce of Longitude hetiveen Chicago and 

 Milwaukee, hy electric signals for comparisons of time, July 

 6th, 1858. 



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

 (at 17/?.. 0.3m. 22s. sidereal time,) 1/j. 027n. 005.78. 



Rate per sidereal day, + 55.27; or per sidereal hour, + 05.22. 



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

 time, (at 10/i. 05m. mean time,) — 4m. 495.1. 



Rate per mean solar day, -f- 0.325; or per mean solar hour, + 

 05.0133. 



1st. — Chicao;o sisnals recorded at both stations. 



1st Mean. — Electric signals sent from Chicago to Milwaukee, 01 06,202 



2d Mean. — Electric signals sent from Milwaukee to Chicago, 01 06.194 



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



above, - - - . - - 01 06.202 



Fe.tulf : — ?,Iilwankoe Station No. 3, west in longitude of the 

 meridian of Chicago oh?erving Station Xo. 3. hy a mean of 



the two sets of signals this night, 



.4- 01 00,20 



