INTRODUCTION. 



XXIII 



tin- magnet with iis stirrup may lie, it was then nicely balanced on the deflecting l*ar, and the 

 following experiments for the value of v[, and times of vibration of the mass, were noted : 



Observations for the value of j with weight. 



Substituting numerical values 



H_ 



43'.0826 







10800' 43'.0826 



= .004005. 



Experiments of vibration without weight. t 



