l6b APPENDIX. 



the time of its return to the fame wire on the feventeenth 

 day*. 



During theiime of this revokition of the fun, an account 

 was kept of the thermometer, and feveral comparifons made 

 of the rate of the going of the pendulum with my fecond- 

 watch : in making which, I always took the time by 

 the watch, when the pendulum fhewed 60": thefe 

 comparifons were chiefly intended to prevent a miftake of 

 a whole minute in eflimating the acceleration of the pen- 

 . dulum, which only fhewed feconds, having no index for 



minutes.: 



* July tKe fixteenth P. M. at 5'' 19' 28" by the watch : the angle 

 S between the vertical and circle of declination was 10° 49 : the 

 fun's altitude 20°; its declination 21° 8': the change in the fun's 

 declination in 24*', was lO' 11": hence the time of the fun's 

 comin"' to the fame vertical hair of a ttlefcope, will be retarded 

 44", I : for (by Cote?, MjVtmatio Errorum, Theor. 35.) 



As fine Z P or cofine latitude, — 



Is to tang S. lO" 49'; — 



So is the change in declin. lo' 11" fine, 



To 1 1' i" the change in the hor. angle fine. 



Which turned into time, gives 



The change in the equation of time is 



Therefore the interval between the two tranfits is 

 It was obferved — 



The difference is the gain of the pendulum 



■ To 



