86 



2d Mean.— Electric signals sent from New Buffalo to Chicago, 03 31.516 

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



as above, - - - - - - - 03 31.520 



Result : — New Buffalo Observing Station is east, in longitude, 

 of Chicago observing station No. 3, by a mean of the two 

 sets of signals, _ . - - _ —0 03 31.518 



/*. m, s. 



Longitude of ChicafTO Station No. 3, - _j- 5 50 31.20 



1st Determination. 



Longitude of New Buffalo Station, west of the meri- 

 dian of Greenwich, - - - - 5 46 59.68 



On the 19th of May, I found T should be obliged to visit New Buf- 

 falo harbour again, so I determined to make it the occasion of another 

 trial of the difference of longitude between that place and Chicago. 

 For this purpose the observations, as recorded, were made at Chicago 

 on the night of the 19th; and also on the night of the 21st, on my 

 return from New Buffalo. The night of the 20th was spent at New 

 Buffalo, where the following time-observations were made at the same 

 station as before, viz. — 

 1859, May 20?^.— Sidereal chronometer No. 2557, fast of New 



Buffalo sidereal time: 

 By 3 observations on oc Coronse Bo- h. m. s. 



realis, east (at 12/t. 51m.) - 1 33 13.59 



By 8 observations on C Hercules, also 



east (at 13/t. 54?n.) - - 133 13.21 



By 11 observations on 2 East Stars, 

 giving weight according to the 

 number on each (at 13/t. 22m.) 1 33 13.31 h. m. s. 



f- 1 33 13.31 



By 5 observations on y' Leonis, west, (at I'Sh. AOin.) + 1 33 12.52 



iJeswZ/— Chronometer No. 2557, fast of New Buf- 

 falo sidereal lime (at 1.3/t. 29?n.) - + 1 33 12.91 



The night was not favourable for observation. The sky was much 

 clouded, which again prevented a selection of the best lime-stars. 

 Those that were observed on were caught, at favourable moments, be- 



