22 



Mr. J. H. Poynting on a method of 



[Nov. 21, 



time I was unable to begin the rider determination. Even then the 

 first resting point had to be rejected. 



Determination of (A + X) — (B + Y). 



Weight 

 in pan. 



Extremities of 

 oscillations. 



Besting 

 point. 



Means of pre- 

 ceding and 

 succeeding 



resting points. 



Differences. 



B + Y 



307*8 



326 -0 

 oil O 



317 -85 



i 



These are all rejected, as the , 

 motion was so irregular. 

 The weights had been 

 changed a short time be- 

 fore, and had probably not 

 reached an uniform tem- 

 perature. 



J 



A + X 



293-7 

 307 '8 



301 -27 



B+Y 



309-6 

 322-3 



316-70 



A + X 



295-5 



309-6 

 297 b 



303 -17 



B + Y 



304-1 



322 7 

 308 "1 



314-4 



A + X 



289-3 



304-4 

 291 '5 



297 -4 







B + Y 



305-5 



315-0 

 307-5 



310-75 



297 -35 



13-40 



A + X 



294 -0 



300-1 

 294-8 



297 -30 



309-95' 



12-65 



B+Y 



304-6 



312-7 

 306 -6 



309-15 



296-51 



12 -54 



A + X 



290- 

 300-7 



291- 5 



295 -72 







Mean (A + X) -(B+Y) =12-86 divisions. 

 .-. (A + X)-(B + Y) = 0-1610 milligramme. 



Greatest deviation from mean =0'54 division = 0-0067 milligramme. 



