Latitude and Longitude of Yale College Observatory. 311 
strument was very neatly made, and I was not prepared to find 
So great an error; yet the sextant had received a blow by which 
the arc was slightly bent, and although it was subsequently 
straightened by an experienced workman, it would be by no 
means strange if the limb were still somewhat distorted. The 
deduced latitude, however, could not be greatly affected by this 
error, because the observations were all made upon nearly the 
same part of the limb, and this part was carefully tested. I take 
therefore 41° 18’ 28” as the latitude of the Observatory, and 
pee it improbable that this result should be five seconds in 
To obtain the longitude, I made several observations of moon 
culminating stars. ‘They were made with a small transit instru- 
ment, the same which is mentioned in Volume xxx. p. 214 of this 
Journal. As the instrument, from its position, commanded only 
a low range in altitude, it was impossible to observe the transits 
of the moon except at particular stages. The observations were 
for this reason much less numerous than they would otherwise 
have been. In Volume rx. of the Memoirs of the Royal Astro- 
nomical Society, pages 254—256, I find corresponding observa- 
tions made on some of the nights at Greenwich, Cambridge, and 
Edinburgh. Each set of corresponding observations has fur- 
nished one determination of the longitude, as is shown in the fol- 
lowing table : 
GREENWICH AND NEW HAVEN. 
ae Obs of AR of}Computed es ge of Meridi- 
1835: eo s first limb. 
: | eee 8. 
June 7 li 34.77 a - 8) ..-33 
ae 12 21.79 A5 
July 6 12 26.28 28 
ae A io" 53.42 43 
| August 4 13 10.94 a4 
CAMBRIDGE AND NEW HAVEN. 
Date. Observed increase of AR of |\Computed Difference of Meridi- 
1835. oon’s first limb. ans. 
m. 8. h. m. s. 
June 7 Li: Gt 4 61 49 
“« 8 12 22.56 64 
| August 4 _ 13 1197 67 
