356 



Sd, 1858, June 28th, Same Station, 



Sidereal chronometer No. 2557, fast: h, m. s. 



By 10 observations on cc Lyra^ E. (at I5h, S7m.) 1 00 07.92 



By 12 observations on u Bootis, W. (at 16/i. 08m.) 1 00 07.20 



Result — Chronometer No. 2557, fast of sidereal time 



for this station (at 15h, 52m.) - - + 1 00 07.56 



By comparison — Chronometer No. 141, slow of mean 



solar time for this station (at 9/t. 25m.) - — 4 53.75 



Atk, June SOth, At Chicago Observing Station No, 3, in latitude 

 41° 53' 46".3 N., longitude 5A. 50m. 315.2. W, 



Sidereal chronometer No. 2557, fast : 



By 10 observations on u Coronas Borealis, W. (at h, m. s, 



19h,22m,) - - - - - 1 00 21.22 



By 13 observations on ec AndromedcB, E. (at 20/i. 



08m.) - - - - - 1 00 20.48 



Result — Chronometer No. 2557, fast of sidereal time 



for this station (at I9h, 45m.) - - + 1 00 20.85 



By comparison — Chronometer No. 141, slow of mean 



solar time for this station, (at 13A. 09m. mean time) — 4 53.1 



5tk» 1858, July 2d, At Chicago Observing Station No, 2. 



Sidereal chronometer No. 2557, fast: 



By 6 observations on u, Lyrcc, E. (at h, m, s, 



16h, 12m.) - - - 1 00 36.95 



By 12 observations on ec Cygni, also 



east (at 17A. 13m.) • - 1 00 37.40 



By a mean of the results from two East stars h, m, s, 



(at IC/i. 42m.) - - - - 1 00 37.17 



By 14 observations on u Bootis, W. (at 10/t. 38m.) 1 00 37.03 



Result — Chronometer No. 2557, fast of sidereal time 



for this station (at lOA. 40m.) - . -f i OO 37.1 



By comparison — Chronometer No. 141, slow of mean 



solar time for this station (at 9A. 53m. mean time) — 4 50.53 



