87 



tween passing clouds, and fewer observations were obtained than was 

 desirable for a close determination of the time. 



A set of observations was obtained on a Virj^inis, S., for the lati- 

 tude; but Polaris, North, was hidden from view, and the result from 

 meridian observations, on only one side of the zenith, being considered 

 imperfect for a close approximation, they were not used. 



The Longitude. 



A second determination of the longitude of this station, is derived 

 from the above time-observations, made at New Buffalo; combined 

 with those at Chicago on the nights of May 19th and 21st, and the 

 telegraphic signals, as follows, viz. — 



Determination of the difference of Longitude between Chicago and 

 New Buffalo, Michigan, by electric signals for comparisons of 

 time. May 20th, 1859. 



Sidereal Chronometer No. 2557, fast, of New Buffalo sidereal time 

 (at 14//.. 23m. 29s. sidereal time), Ih. 33m. 13s.l7. 



Rate per sidereal day, + 6s.966; or per sidereal hour, + Os.29. 



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

 time (at 10^. 26m. 51s. mean time), 4m. 40s.65. 



Rate per mean solar day, — Os.47; or per mean solar hour, — 

 Os.0196. 



1st. — Chicago signals recorded at both stations. 



1st Mean. — Electric signals sent from Chicago to New Buffalo, 03 31.494 



