49 



2d. — Ashtabula signals recorded at both stations 



2d Mean. — Electric signals sent from Ashtabula to Chicago, 27 21.42 



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



as above, ------ 02721.42: 



Result: — Centre of the Public Square at Ashtabula, east, in 

 longitude of Chicago observing Station No. 3, by a mean of 

 the two sets of signals, - - - - —0 27 21.42 



Longitude oC Chicago observing station No. 3, west 



• f the meridian of Greenwich, 



+ 5 50 .31.20 



Longitude of the centre of the Ashtabula Public 



Square, west of the meridian of Greenwich, - 5 23 09.78 



Equal, in arc, to - 



Latitude (ap[)roximate) as before, 



80M7' 26".7 VV. 

 41° 52' 04" N. 



VIIL ERIE, PENxNSYLVANlA. 



Station. — The point of intersection of the two diagonal lines of the 

 lumber-lot of Mr. William Sandborn, fronting on Sixth street, between 

 Holland and French streets. 



\st. Ob ser cations fir the Latitude. 1858, Avgust Sth. 



By 16 observations on Polaris, north, combined with 



16 observations (circum-meridinn) on a. Aquarii, ^ ^ ^^ 



south, - - - - - 42 07 53.8 



Same night — By 28 circum-meridian altitudes of 

 Allair [cc Aquilse,) south, combined with 22 cir- 

 cum-meridian altitudes of y Cephei, north, - 42 07 55.8 



Result — Latitude of station. 



42 07 54.8 N. 



VOL. VII. G 



