359 



By E. and W. stars (at 19^. 427«.) h. m. s. 



using horizon roof No. 1, + 1 01 45.75 h. m. s. 



+ 1 01 45.75 



By 6 observations on « Coronas Bo- 

 realis, W. (at 19/<. 24772.) using 

 horizon roof No. 2, - - 1 01 46.04 



By 9 observations on ex. Andromedse, 

 E. (at 20A. 02m.) using also ho- 

 rizon roof No. 2, - - 1 01 45.31 



By E. and W. stars (at 19//.. 437rt.) 



using horizon roof No. 2, -f 1 01 45.68 



+ 1 01 45.68 



Result — Chronometer No. 2557, fast of sidereal time 

 for this station (at \Qh. A2m. 305.) by 13 obser- 

 vations on u Coronce Borealis, W., and 14 ob- 

 servations on cc Andromedse, E. - - + 1 01 45.71 



By comparison — Chronometer No. 141, slow of mean 



solar time for this station (at 12/t. 0777J. mean time), — 4 44.58 



lOth. 185S, July ISth. At Chicago Observing Station No. 2, 



Sidereal chronometer No. 2557, fast: 



By 9 observations on a Lyrse, E. (at h. m. s. 



15/i. 58771.) - - - 1 02 01.85 



By 14 observations on a, Cygni, also 



E. (at nh. 18/71.) ^ - 1 02 01.75 



It. m. s. 



By 23 observations on 2 East stars (at I6h. 38m.) 1 02 01.8 



By 19 observations on « Bootis, W. (at I6h. Sim.) 1 02 01.42 



Result — Chronometer No. 2557, fast of sidereal time 



for this station (at I6h. 36771.) - -f 1 02 01.61 



By comparison — Chronometer No. 141, slow of mean 



solar time for this station (at Sh. 49771.} - — 4 43.01 



