386 



On the 19th of July I made another visit to Madison, and returned 

 to Chicago on the evening of the 21st. 



Observations for the time, at the Chicago Station No. 2, on the 

 18th and 21st, will be found among the preceding records. 



The night of the 19th was not very favourable for observations at 

 Madison. I was enabled to observe nine altitudes of u. Lyrre, east, 

 for the time, but the sky was so cloudy the rest of the night that no 

 observations could be made on a star west for eliminating any small 

 errors that might appertain to the partial result obtained Irom otLyrsB. 



Telegraphic signals were, however, exchanged with Chicago, with 

 a view to obtaining an approximate result for the longitude of Madison 

 in case I should not be able to get a more satisfactory set of time- 

 observations before leaving that place. * 



Fortunately such an opportunity occurred on the next night, when, 

 occupying a station (No. 2) immediately in rear of the Baptist church, 

 on Carroll street, between Washington and Morris streets, the follow- 

 ing observations were made : From this station, to a point perpen- 

 dicularly under the apex of the steeple of this church, is N. 45° E. 

 90 feet ; from thence to a point perpendicularly under the centre of 

 the dome of the State Capitol, we ran, first, N. 45° E. 268 feet, and 

 then due north 320 feet. Hence the reduction from this Madison 

 Station No. 2 to the dome of the State Capitol, is, in latitude, + 5" 

 .68, and in longitude — 3".41 in arc,= — Os.23 in time. 



Observations for the Time at Madison Station No. 2. Approx, 



Latitude, 44° 04' 33".l N. 1858, Jvhj 20th. 

 Sidereal chronometer No. 2557, fast: 

 Bv 8 observations on cc Aquike (Altair) cast (at 17/t. 

 05m.) ..... 



By 13 observations on a Bootis, west (at 17^. Sim.) 



Result — Chronometer No. 2557, fast of sidereal time 

 for this station. No. 2 (at 17/i. 21m.) 



The above result for the time at Madison, combined with the time- 

 observations at Chicago on the nights of July 18th and 21st, and the 

 telegraphic signals passed on the night of the 20th, gives the longi- 

 tude of Madison as follows, viz. 



•^ Note. The approximate time, computed from those ol'tscrvations on a. 

 Lyrse, on the night of the 19th, and the telegraphic signals of that night, 

 give, as the approximate longitude of the State Capitol, west of Greenwich, 

 5/i, 67m. 32s. 5, which is O.v.75 greater than the result adopted from tlie ob- 

 servations and signals of tlie night of July L'Otli. — J. D. G. 



