109 



is 227 feet. Hence the reduction from our new station at the centre 

 of the public square to Talcott's station is, in latitude, + 2". 19, and 

 in longitude -f 0".63 in arc, = 0s.04 in time. 



The positions of other points in relation to our observing stations, 

 were also fixed by our survey, and will be given hererfter. 



It will be remembered that the position of our station of June 21st, 

 1859, was stated, in our former paper, to be approximately, as fol- 

 lows, viz. (See Vol. VI. page 363.) 



Latitude, .... 41° 43' 25" xN. 



Longitude, west of Greenwich, - 57i. 47m. 37s.41 



This was the result of a few observations made within the space of 

 one hour and forty minutes, on that night, and a series of telegraphic 

 signals for comparing the longitude with the meridian of Chicago. 



A reduction of the above determination, to our station of 1859, 

 gives the position of the centre of the public square, as follows, viz. — 



Determination 1st, of June 21st, 1858. 

 Latitude, .... 41° 43' 09".36 



Longitude, west from Greenwich, - 5/t. 47m. 37s. 12 



We will now give the observations made in 1859, and the results, 

 as follows, viz. — 

 At the centre of the Public Square in Michigan City, Indiana, 

 1st. The Latitude. 

 1859, ilfaj/ 11th. By 14 circum-meridian altitudes of 



ct Virginis, south, combined with 17 altitudes of o / r 

 Polaris, north: latitude of station, - - 41 43 08.3 



1858, June 21st. By 10 circum-meridian altitudes of 

 ■ Libra?, south, combined with 5 altitudes of Po- 

 laris, north, reduced from the old, to this station, 

 as already shown, - - - - 41 43 08.36 



Result adopted — Latitude of the centre of the Michi- 

 gan City Public Square, - - - 41 43 08.33 



2d. Observations for the Time. 1859, April 28th. 

 Sidereal chronometer No. 2557, fast : 

 By 10 observations on s Bootis, east h. m. s. 



(at 12h. 11m.) - - - 1 31 05.20 



By 10 observations on ex. Coronas Bo- 



realis, also east (at llh. 44m.) - 1 31 05.33 



