30 



Resvlt adopted — Chronometer No. 2557, fast of si- //. m. s. 

 dore.il time for this station (at 5/i. 30m.) + 1 26 04.15 



By comparison. — Chronometer No. 141, was slow 

 of mean sohir time for this station (at Ih. 28///. 

 mean time) - - - - - — 4 41.29 



6/A. 1S59, February '2'^d. At the same Station. 



Sidereal cliro no meter No. 2557, fast: 



By 9 observations on Arcturus, {x Bootis,) east (at //. m. s. 



lOh. i)9m.) 1 26 20.55 



By 5 observations on /3 Geminorum, west (at 10//. 



59m.) - - - - - 1 26 20.66 



Resvlt — Chronometer No. 2557, fast of sidereal time 



for this station (at 10//, Mm.) - - 1 26 20.60 



By comparison — Chronometer No. 141 was slow of 

 mean solar time (or this station (at 12/i. 20/?/. 

 mean time) - - - - - — 4 43.68 



This night was not very favorable for observation. It was cloudy, 

 with a few spots of clear sky, within which the only time-stars that 

 were visible were Arcturus and /3 Geminorum. They do not match 

 very well in Declination, — that of the former being 19° 55', and that 

 of tiie latter 28^ 22', both North. As the latitude of the station is 

 well determined, however, there is probably very little error in the 

 deduced time from that cause. But there was a very strong wind, 

 which made it difficult to hold the sextant as steady as was desirable 

 for close work. As the time deduced affects the accuracy of the longi- 

 tude of Dunleith, Illinois, herein reported, we will endeavour to verify 

 the result by another series of observations, whenever an opportunity 

 shall occur. We do not apprehend that the error will be found to 

 exceed a fraction of a second of time. 



1th. 1859, February 21th. At the same Station. 



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



By 10 observations on u Arietis, west (at 5//. 50/?/.) 1 26 45.42 

 By 13 observations on y' Leonis, east (at 6/t. 24;//.) 1 26 45.74 



