332 On the geographical Position of Lynn 



the mean of near 200 obbervaiions on the Sun and fixed 

 stars, taken with a nuiial circle <>t 15 inches riianieter. made 

 by Mr. Troiighton, gave the latitude 52° 43' 25'' N. Hence 

 we ;nav inie. ihat tlie laiiiude ot the place of observaiioii 

 is 52" 15' 24" 4 N. 



The longitude was found by three different methods : 

 first, bv chronometers ; secondly, bv the eclipses of the 

 salellifes of Jupiter; and thiidlv, by the transit of Mejcury 

 over the Sun, November 9, 1802. The eclipses ucre ob- 

 server by a three feet reflector niagnifving about 100 limes, 

 made by Mr, John Watson ; and the transit of Mercury 

 by a 3; feet refractor maiinifving about 80 times. 



The longitude of my station found by chronometers, 

 made by Mr. Barraud, is as follows ; 



Ko. of Clirono- . . Long'tude in Time 



meter. E. of Greenwich. 



1 83 gave 1' 33,9 



315 ditto 1 36,3 



315 May 23, 1804 ditto 1 35,8 



305 July 12, 1 bOl ditto 1 32,6 



312 May 20. 1805 ditto 1 35,1 



312 Octobers, 1 806 ditto 1 36,2 



312 Ditto 18, 1806 ditto 1 35,9 



Longitude deduced from nine observations \ 



on the eclii)?cs of the satellites of JnpiterJ ' 



Longitude deduced from the transit of § ..1 35,6 



The mean longitude 1 35,2 

 The chronometers were coinpared at Somerset House in 

 the Strand, London, by the late Mr. G. Gilpin, and by 

 mvseU at Lynn. The tiiTie here was computed from trans- 

 its of the Sim and lixtd stars over the meridian, observed 

 >\ith a 3f feet transit telescope, made by the late Mr. 

 Sisson, and greatly improved by Mr. Troughton. The 

 clock, which stands in the same rooiTi, was rnade by the 

 late Mr. James Bullock*. 



The observations on the eclipses of the satellites of Ju- 

 piter, and those on the transit of Mercury, were compared 

 with corresponding observations made at the Royal Obser- 

 vatory. 



Although the longitude derived from nine observations 

 on the immersions and emersions of the satellites of Jupiter, 

 differs but little from the longitude found by the other twt) 



* For an account of the going of thi» clock, see PhiL Mag. vol. xxxiii. 

 p. 00, and vol. xixiv. p. 3, 



iflcthods. 



