ELECTRICAL CHIMES. 607 



the experiment comes soon to an end because the balls adhere to the 



sides of the glass. Small elongated pieces of pith with blunt 



points, of the shape and size given in fig. 320, J., 



or pieces of paper cut like fig. 320, B, are less 



liable to be thrown about than common pith-balls. 



Bodies of this shape dance pretty long between 



disc and table, without requiring a glass cylinder 



to keep them from flying sideways. The pieces of 



paper sometimes lie motionless at first upon the 



table, but begin to dance when they are a little 



. . , FIG. 320 (real size}. 

 It the cover of the electrophorus is simply 



charged in the usual way, by placing it upon the cake, touching it 

 with the finger and then raising it, it will without the help of the 

 electrical machine cause the balls to dance if held a few centimetres 

 above them. This will of course only last for a very short time, but 

 may be frequently repeated. 



If a few pith-balls are placed upon the cover while it is still upon 

 the cake of the electrophorus, and .the cover be raised, repulsion 

 will take place and the balls will fly off in wide arcs. 



V 



1 Electrical chimes ' may be constructed by means of 

 two small bells, one of which, b in fig. 321, J., is in me- 

 tallic connection with the conductor of the machine, 

 while the other, a, communicates with the ground. 

 Between them is suspended, by a silken thread, a small 

 metallic clapper. When the machine is worked, b be- 

 comes electric, attracts the clapper and repels it again 

 immediately after contact. Partly by this force of re- 

 pulsion and partly by the force with which the unelectric 

 bell a attracts the electrified clapper, it flies to the bell a, 

 and gives up its electricity because a communicates with 

 the ground. As soon as the clapper has thus returned 

 to the neutral state it is again attracted by b, and the 

 process is repeated as long as the machine is worked. 

 The continued striking of the clapper produces a gentle 

 tolling of the bells. 



