103 



Sidereal chronometer No. 2557, fast of sidereal timer 



1st Set. 



By 4 pairs of equal altitudes of the sun, observed 

 A. M. and P. M., middle time of observations 

 being apparent noon, or say (20A. 227n.) sidereal 

 time of the 22d, - - - - + 59 09.3S 



2d Set. 



By 10 observations on /3 Geminorum, 



east, (at 28A. 267W.) - - 59 10.10 



By 2 observations on fi Andromedse, 



west (at 28/?. 50m.) - - 59 10,51 



By E. and VV. Stars, (at 2Sh. 38m.) 59 10.30 



4- 59 10.30 



Result — Chronometer No. 2557, fast of sidereal time 

 for this station, January 23d, 1859 (at Oh. 30m. 

 sidereal), - - - - - + 59 09.81 



Here we had, again, an unfavourable night for observation, being 

 so cloudy that only two observations could be obtained west, for the 

 time. The clouds were so dense to the north and south, that no ob- 

 servations whatever could be got for the latitude. 



The time derived from the East and West stars, however, agrees 

 well with that obtained from the equal altitudes of the sun, if we take 

 into account the usual rate of the chronometer for the elapsed time 

 between the two sets. This is evidence enough that our approximate 

 latitude, used as a term in the equation for computing the time by the 

 stars, was accurate enough for that object. The time may, therefore, 

 be considered as pretty well determined at Cleveland on this occasion. 

 But the disturbance in the usual rate of mean solar chronometer No. 

 141, owing to the very high temperature of the room in which it was 

 kept at Toledo, during this journey, must be considered. Although 

 we may suppose that the new rate thus acquired, was probably uni- 

 form during our absence from Toledo, yet we cannot be certain that 

 it was so. All things, therefore, being considered, we are inclined to 

 attribute equal weight to the resulting longitude of Cleveland, from 

 this journey, and that which was obtained on the night of August 5th, 

 1858, by comparison with the meridian of Chicago. 



The Longitvde. 

 The result of the time-observations at Cleveland, of January 23d, 

 above given, combined with that obtained for Toledo, from the obser- 



