110 



ELECTRICITY. 



concerned in this case, quite different to any- 

 thing we have met with before ; but the force 

 is the same. We have here then a double at- 

 traction a dual attraction or force one at- 

 tracting and the other repelling. 



Again, to show you another experiment 

 which will help to make this clear to you. 

 Suppose I set up this rough indicator again 

 [the excited shellac suspended in the stirrup] ; 

 it is rough, but delicate enough for my pur- 

 pose ; and suppose I take this other piece of 

 shellac, and take away the power, which I can 



Fig. 34. 



do by drawing it gently through the hand ; and 

 suppose I take a piece of flannel (fig. 34) which 



