352 MEASUREMENT OF AN ARC 



It may be neceflary to notice here, that in Art. 2. of the Appendix 

 to my lad paper, there has been an overlight in taking the mean of 

 two computed degrees, 60465.5 and 60498, which mean is 60481! in 

 place of 60485!; or 60482 to latitude 11 6 24 which mult therefore 

 affect all the refults given in that paper. But as the principal ones 

 are computed according to the prefent meafurement, it is unnecefla- 

 ry to recompute thofe formerly given. By uling the mean ratio of 1 : 



a.0033227, with the degree 11 37 4g, equal to 60480.42 fathoms, the 

 degree of longitude at the equator will come out 60858.47 fathoms 

 and the length of the equatorial diameter of the earth will be 6973866 

 fathoms, from whence, by proceeding as in Page 98, of this 

 volume, the quadrantal Arc of the elliptic Meridian will be had, 

 equal to 5468170.8 fathoms, or 3937082976 inches, which divided 

 by io.'cooooo, will give 35^37083 Engli/h inches for the mcafure of 



o 



the French metre meafured at the temperature of 62 which differs only 



T¥ *g-th part of an inch from that meafured by the French mathemati- 





 dans at 32 and reduced to the fame temperature 



