CHAPTER 

 EXPERIMENTS WITH THE TOPLER MACHINE. 



IN experiments with the frictional machine, such as 

 the charging of Leyden jars, and the ringing of bells, 

 as already described, induction is produced by connect- 

 ing one part of the apparatus with the earth, and 

 another part with the prime conductor. But in the 

 Holtz and Topler, the charge is accumulated in the 

 Leyden jars instead of on a prime conductor ; and any 

 change of potential in one jar must be compensated by 

 a corresponding inductive change in the opposite jar. 

 Hence to obtain the full inductive effect, connection 

 must be made with the opposite jars. 



For convenience in making this connection, holes are 

 drilled in the knobs surmounting the jars, and the 

 charge is conveyed by insulated conducting cords, hav- 

 ing brass tips which fit these holes. 



Thus, by connecting the inner and outer coatings of 

 a Leyden jar or battery with the opposite jars in this 

 way, a full charge can be given very rapidly. 



In a similar manner, image plates, bell chimes, and 

 other apparatus, mounted on separate stands, can be 

 connected and used. 



ELECTRIC CHTME FOR TOPLER MACHINE. Fig. 41 

 represents a chime designed by the author, which is 

 mounted on the machine itself. It consists of two 

 brass arms A and J5, insulated by an ebonite connector 



