APPENDIX. 



153 



Observations for determining the Acceleration of the 



Pendulum. 



Defcription of the Pendulum with which the Obfervations 

 were made, by Mr. Gumming. 



" ^T~^HE apparatus with which the following experi- 

 ments were made, was prepared for the voyage 

 " with all the care which the (hortnefs of the time 

 " would admit, and particular attention was paid to its 

 " fimplicity. The pendulum was that which the late Mr. 

 " George Graham had conftrufted, to afcertain the exad 

 " diftance between the center of motion and center of 

 " ofcillation of a pendulum to vibrate feconds at London. 



" The ball is a fphere of folid brafs, whofe diameter is 

 " three inches and ninety two hundredth parts of an inch ; 

 " and whofe weight is nine pounds and one quarter. 



" The rod is a round fteel wire, one tenth of an inch 

 " thick, and is fo firmly fcrewed into the ball, that h 

 " cannot be unfcrewed by hand, nor the length of the 

 " pendulum altered without the application of propei! 

 ** inrtruments for that purpofe, there being no adjufting 

 " fcrew as in clock-pendulums. 



« The 



