THERMOMETRICAL OBSERVATIONS. 197 



On the 10th of February at 9'' 10' 26'' P. M. an emerlion of tlis 2d 

 iatellite of 7/ was obferved, the clock was then 26' 26" too flow mean 

 time, the obfervation was therefore made at g*" 36' 53" mean time, from 

 wliich deduifl 14' 38" the equation of time, and the remainder g^ 22' 14'' 

 will be the apparent time of the obfervation, which taken from 15'' 22' 5" 

 the apparent time at Greenwich by the theory, tlie remainder 5'' 59' 51'' 

 will be the difference between the meridians. 



The longitude given by the 2d fatellite, does not appear from tlie theory 

 to be entitled to more than half the weight o:' either of tliofe by the tirft ; 

 this being admitted, the longitude will be had as below. 



Longitude weft. 

 By the emerfion of the i ft fatellite! . . 6'' i' 25" 

 on the 14th of Jan. J . . 6 i 25 



By . do. . on the 21ft of Jan. [■ 



Bj an emerfion of the 2d fatell 

 on the loth of Feb 



6 I o 

 610 



5 59 51 



Mean ...,60 56 = 90° 14' weft 

 from Greenwich, or i'' o' 21'' = 15° j' 15" weft from Philadelphia. 



The longitude of the city of New-Orleans is fet down in Robertfon's 

 Navigation at 89° 54' o" or 5'' 59' 36" weft. In the requifite tables at 

 89° 58' 45'' or 5" 59' 55" W. and by the French academicians* at about 

 90° or 6'' weft from Greenwich. — 1 he difference is not confiderable, and 

 perhaps the refult of my obfervations may agree with tlie foregoing autho- 

 rities ftill more nearly, when compared with correfpondiny; ones, or others 

 made about the iame time, at any obfer\'atory the longitude of which has 

 been accurately fettled. 



The obfcr\'ations on the paflage of the B over 1( , and three of his fa- 

 tellites, before mentioned, will be reduced to apparent time, by adding 

 34" to each obfervation. 



Obfervations made on the tranfit of ? in May 1799 at 

 Miller's place on the Coenecuch river, commonly, 

 (though erroneoufly), called the Efcambia, in lat. 30'' 

 49' 33' N- ^y rneafurement, from the fouth boundary 

 of the United States, and due fouth from the end of 

 two hundred and forty-eight miles, and one hundred 

 and eighty-fix perches eafl: from the Miffiflippi, in the 

 parallel of 31° N. lat. 



May 2d. The inftruments arrived in a boat from the 

 head of Penfacola-Bay. 

 Vol. V. D d 3d. 



• Expofition du calcul par de la Lande 1762. 



