no 



By 20 observations on 2 West Stars, 



(at llA. 28m.) - - 1 31 05.26 h. m. s. 



1- 1 31 05.26 



By 10 observations on j3 Geminorum, west (at llh. 



SOm.) - - ' - + 1 31 05.29 



Result — Chronometer No. 2557, fast of sidereal time 



for this station (at 11/t. 29m.) - - -f 1 31 05.27 



The above result for the Michigan City time, combined with the 

 observations made on the 27th and 29th of April, for the time at 

 Chicago, and the following telegraphic signals, give us a second deter- 

 mination of the longitude of Michican City, viz. — 



Determination of the Difference of Longitude between Chicago and 

 Michigan City, Indiana, by electric signals for comparisons of 

 time, April 28th, 1859. 



Sidereal Chronometer No. 2557, fast, of Michigan City sidereal time 

 (at 12A. 47m. 47s. sidereal time), Ih. Sim. 05s.63. 



Rate per sidereal day, + 6s.669; or per sidereal hour, + Os.2775. 



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

 time (at lOA. 18m. 32s. mean time), 4ot. 41s.:^2. 



Rate per mean solar day, — 0s.l7; or per mean solar hour, — 

 Os.007. 



1st. — Chicago signals recorded at both stations. 



1st Mean. — Electric signals sent from Chicago to Michigan City, 02 53.49 



