Latitude and Longitude of Yale College Observatoiy. 311 



stmment 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''^ ds the latitude of the Observatory, and 

 think it improbable that this result should be five seconds iu 

 error. 



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 ix. 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. 



CAMBRIDGE AND NEW HAVEN. 



