115 [ 237 ] 



Mr. Walker thinks the first of these results as likely to be correct as 

 Ihe second, on account of the uncertainty whether the value of»?=-j-3" 

 used by Mr. Airy in reducing the Greenwich observations, applies to occuU 

 tations, for which Burckhardt's semi-diameter is, perhaps, better adapted. 

 In this instance, however, the mean of the two naturally presents itself for 

 acceptance. We have, then, in fine — 



h. 

 Mean longitude from the occultalion - - - 6 



Chronometric longitude deduced from Baltimore - - 6 



Mean of 15 sets, or 224 lunar distances E. and W. 3 - 6 



Mean - - - - 6 1 0.68 



Longitude in arc - - - 90«> 15' 10".2 



IV. TI TANKA-TANNINAN LAKE — EAST SHORE. 



For the observation of the end of the solar eclipse, made here on the 18th 

 «f September, 1838, I was supplied with a telescope of Dolland, having a 

 magnifying power of about 120. 



By Professor Kendall's memoir on the longitude of several places in the 

 United States, deduced from observations of this same eclipse, we see that, 

 rising his co-ordinates, computed after the method of Bessel, viz: 



* = — 14".782 

 ^ = — 7".310 

 ,7 = 4- 3". 198 



These valuiis, with their corresponding co-efficients in Table I, applied, 

 give, for the longitude of Ti-tanka-tanninan - - 6A. 13m. 23.56*. 



Longitude in arc - - 93° 20' 53".4 



V. GOEBEL S RESIDENCE, NEAR NEWPORT, FRANKLIN COUNTY, MISSOURI. 



1. Mr. David W. Goebel, from Coburg, Germany, well acquainted with 

 practical astronomy, and supplied with a Hadley's sextant, a good clock, 

 and a telescope having a magnifying power of about forty times, has been 

 kind enough, at my request, to observe for the solar eclipse of the 18th of 

 September, 1838. The authentic data of the observations are as follows: 



Beginning at 1/u 59m. 13.35., true time of the place. 

 Ending at 4 46 41.2 do, do. 



The conversion of this time into mean time, gives (he date of the ob- 

 servation as represented in Table 1. Now, introducing into the formula 

 (A) the values of f, ?, and ^, employed for th« preceding station, together 

 with the corresponding co-efficients, «, 6, and c, in Table I, we derive for 

 ^he longitude of Goebel's residence — 



h. m, s. 

 By beginning of eclipse - - - 6 4 30.41 

 £nd 6 4 16.45 



Mean - - - 6 4 23.43 



