o APPENDIX. 



revolution of the fun, there is reafon to believe that the 

 period of three days, determined by a mean of fifty- five 

 a.ltitudes, taken on the 15th and 18th of Auguft, might 

 be relied on to one fecond at mod : and that, although 

 the conclufion from the obfervatlons of Auguft are not fo 

 decifive, on account of its depending in fome fmall degree 

 on the regularity of the watch, it ftrongly corroborates the 

 conclufion from the obfervations in July, as it proves that 

 the acceleration of the pendulum proceeded from an uni- 

 form caufe, which produced equal eifeds in each cafe. 

 This is yet further proved, by comparing the pen- 

 dulum when it rtturned to London with the fame clock 

 with which it had been compared before the voyage, the 

 thermometer being at this time alfo at 60°, and the addi- 

 tional weight of a mufket bullet and a half being applied 

 to the weight which kept it going ; the pendulum and 

 the clock were found to agree {o well, that no fenfible 

 difference could be diftinguifhed in their beats for the 

 fpace of twelve hours. 



From ail which circumftances it may fairly be con- 

 cluded, that a pendulum which vibrates feconds at 

 London, will gain from feventy-two to feventy-three 

 feconds in twenty-four hours, in latitude 79° 50'; 

 allowing the temperature of the air to be the J^me at 

 both places. 



4 Thefe 



