CENTRE OF GRAVITY. 



23 



with a world of trouble, and hang this wire 

 with bullets at each end about her neck, it is 

 very evident that, owing to there being those 

 balls of lead hanging down on either side, in 

 addition to the lead inside, I have lowered the 

 centre of gravity, and now she will stand upon 

 this point (fig. 7); and what is more, she proves 

 the truth of our philosophy by standing side- 

 ways. 



I remember an experiment which puzzled me 

 very much when a boy. I read it in a conjur- 

 ing book, and this was how the problem was 

 put to us : " How," as the book said, " how to 



Fig. 8. 



hang a pail of water, by means of a stick, upon 

 the side of a table" (fig. 8). Now I have here a 



c 4 



