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



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



Weight in 

 pan. 



Extremities of 

 oscillations. 



Resting point. 



Mean of pre- 

 ceding and 

 succeeding 



resting points. 



Differences. 



A + X 



206-3 



212 -7 

 206-8 



209-62 



This was rejected as being so 

 much higher than the rest. 



B+Y 



209-0 



206*4 

 208-6 



207 -6 







A + X 



212-4 



204-0 

 211 -3 



207 *92 



207 -71 



•21 



B + Y 



206-8 



208-8 

 206-9 



207 '82 



207 -88 



•06 



A + X 



211-8 



204 -4 

 210-8 



207 -85 



207 -64 



•21 



B+Y 



209*1 



206-1 

 2U8-6 



207 -47 



207-86 



•39 



A + X 



210-7 



205*5 

 209 -8 



207 '87 



207 -11 



•76 



B + Y 



208-5 



205-3 

 207-9 



206 -75 



207-83 



•78 



A + X 



209-7 



205-1 

 208 -9 



207 -20 



206 -45 



•75 



B + Y 



203 3 



208-7 

 203-9 



206 -15 







Mean (B+Y) — (A + X) = '49 division =0-00655 milligramme. 

 Greatest deviation from mean ='43 division =0'00575 mgm. 



A and B had here been cleaned and B readjusted by scraping. A 

 small vessel containing calcium chloride was put inside the balance to 

 dry the air. This improved the action of the clamp, diminishing the 

 cohesion. 



