071 his Pendulum Observations. 



Ill 



length of the pendulum at New York as trifling : so also are 

 the corrections at the four other stations, where the rate of 

 the clock was obtained with the repeating circle. The obser- 

 vations recalculated show the clock to have been gaining at 

 Jamaica 4%07 daily, instead of 4% 14; at Trinidad 3%23 in- 

 stead of 3S19; at Maranham 2%69 instead of 2%70; and at 

 Bahia 2',76 instead of 2%68, No correction amounts to one- 

 tenth of a second per diem, and the joint effect (in the com- 

 parison between the tropical stations and those of the middle 

 and northern latitudes) does not exceed one hundredth of a 

 second per diem ,- a quantity far too small to have any in- 

 fluence on the deductions. 



I avail myself of the opportunity to subjoin a table of the 

 corrected lengths of the pendulum, for the convenience of any 

 person who may have occasion to employ them. The latitudes 

 are given in the table to the nearest half minute, being suffi- 

 cient for the required purpose. The observations of the 

 southern stars have been recalculated with Mr. Fallows's right 

 ascensions and declinations. The only alteration produced 

 thereby worthy of notice is in the latitude of Ascension, from 

 7° 55' 48" to 7° 55' 10'', by employing the more correct ap- 

 parent declination of « Ceiitauri : the alteration, however, has 

 no influence beyond the mere correction ;as 39*0152 + 0-20227 

 sin* 7° 55' 48", and 39-0152 + 0*20227 sin'- 7° 55' lo" give 

 the same theoretical pendulum for Ascension. In no other 

 instance do the corrections exceed a very few seconds. 



London, Aug. 13, 1827. 



Edward Sabine. 



NcxL' Series. Vol. 2. No. <J. Sept. 1827. 2 A XXXIII. No- 



