20 



Mr. J. H. Pointing on a method of 

 Determination of (B-j-X) — (A+Y). 



[Nov. 21, 



Weiglit 011 

 pan. 



Extremii les of 

 oscillations. 



Besting point. 



Means of pre- 

 ceding and 

 succeeding 



resting points. 



Differences. 



A + Y 



254 -5 



272-9 

 257-3 



264 -40 







B + X 



267 -5 



249-8 

 264-8 



257 -97 



263 -27 



5-30 



A + Y 



258 '5 



265-4 

 259-3 



262-15 



257 -04 



5-11 



B + X 



259 -3 



253-6 

 258 -0 



256 12 



261 -87 



5 75 



A + Y 



253 -5 



268 -5 

 255 -9 



261 -60 



255 -63 



5-97 



B + X 



244 -6 



264-5 

 247-0 



255 -15 



261-87 



6-72 



A + Y 



273 6 



252 "0 

 271-0 



262 -15 



255 -85 



6 -30 



B + X 



252 7 

 260 



253 -5 



256-55 



262 -90 



6-37 



A + Y 



275 



253-7 

 272-4 



263 -70 





Mean 

 difference 

 5-93 



. • . (B +X) - (A + Y) = -0121 2 x 5-93. 



= '0718 milligramme. 



Greatest deviation from the mean — 



= '82 division. 



= '0099 milligramme. 



The weather during this series of weighings was very unfavourable, 

 with frequent heavy showers. 



