30 Mr. J. H. Poynting on a method of [Nov. 21, 



Determination of (B + X) - ( A + Y) . 



Weight in 

 pan. 



Extremities of 

 Oscillations. 



Besting point. 



Mean of pre- 

 ceding and 

 succeeding 



resting points. 



Differences. 



B + X 



216-9 



214 -6 

 216-6 



215-67 







A + Y 



256-7 



233-8 

 253-9 



244-55 



216-08 



28-47 



B + X 



220-1 



213-7 

 218-5 



216-50 



244 -90 



28-40 



A + Y 



254-8 



236-7 

 ' 252 -8 



245 -25 



217 -07 



28-18 



B + X 



221-5 



214-5 

 220-1 



217 -65 



245 -48 



27-83 



A+Y 



257-5 



235-3 

 254-8 



245 -72 



217-37 



28 -35 



B + X 



220-9 



214-0 

 219 -5 



217-1 



245 -68 



28-58 



A + Y 



246 -8 



244 -5 

 246 -8 



245 -65 



216 -83 



28-82 



B + X 



223-7 



210-5 

 221 -6 



216-57 







.-. mean (B + X) - (A-fY) = 28*38 divisions =0*4043 milligramme. 

 Greatest deviation from mean = - 55 division ='00784 milligramme. ♦ 



