30 ON THE ESTIMATION OP SMALL EXCESSES OF WEIGHT. 



M^r = 3565i, 



2Pfl* = 94704^ 



P = ^-'j2j\. milligrammes. 



The length of time occupied in this determination was 

 not quite a quarter of an hour. 



The following table contains a series of results which I 

 hare obtained of the weight of two centigramme riders, 

 the first of which was accidentally destroyed after the 

 conclusion of the fourth determination. As the rider was 

 always placed at division 5 on the beam_, the values given 

 in the table are double those actually obtained. 



No. of 

 experi- 

 ment. 



Mffl^+zFa^ 



t in 

 seconds. 



n. 



Weight of 

 rider in mil- 

 ligrammes. 



Mean yalue. 



I 



145364 



8-921 



13-458 



9-78 



- 9-96 milli- 

 grammes. 



/ 



-11-35 inilli- 

 grammes. 



2 



309356 



17-65 



25-49 



10-05 



3 



519769 



20-435 



19-12 



955 



4 



130355 



13-10 



3471 



10 '47 



5 



130355 



12-87 



36-6 



11-44 



6 



130355 



12-72 



35-5 



11-35 



7 



130355 



12-725 



35-83 



11-45 



8 



130355 



12-81 



35-5 



1I-20 



9 



130355 



12-903 



36-37 



II-3I 



1 

 10 454405 



19-406 



22-o8 



10-58 



