Fig. 7 — A pith-ball suspended by silk, after 

 touching the electrified ebonite is repelled. 

 Part of the electric charge on the rod has 

 passed to the ball, hence " like charges re- 

 pel." 



Fig. 8. — Negative ebonite rod between 

 two balls, left charged negatively from 

 ebonite rubbed with cat's fur, the other 

 charged positively from glass rubbed with 

 silk. Like charges repel, unlike charges 

 attract. 



Fig. 9. — A pith-ball suspended by cotton 

 thread clings to the charged ebonite for a 

 time. When the pith-ball lets go both are 

 neutral, as in figure 5. 



Fig. 10. — Brass conductor on glass 

 stand, also pitb-balls. Both neutral. No 

 attraction. 



Fig. 11. — Charged ebonite rod held near 

 end of brass conductor. Pith-ball is at- 

 tracted, hence conductor has been charged 

 by the influence of a charge at a distance. 



Fig. 12. — Two brass plates on glass 

 stands. Plates separated. One plate 

 charged, as shown by the repulsion of the 

 pith-ball. 



i.e., by " induction. 



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