114 



ELEMENTS OF STATIC ELECTRICITY. 



THE FOUR-PLATE TOPLER MACHINE. This machine 

 has the same construction in front as the two-plate ma- 

 chine as shown by Fig. 38, but a special construction 

 for the two rear plates which will be understood by 

 reference to Figs. 39 and 40. 



The end view, Fig. 39, shows two pairs of plates, the 

 position of the rear pair being reversed, which brings 

 the stationary plates into the center, back to back, be- 

 tween the revolving plates ; 

 so that the inductors are on 

 the inner surfaces of the 

 stationary plates, and the 

 carriers on the outer sur- 

 faces of the revolving plates, 

 which being mounted on 

 the same shaft, with a col- 

 lar between them, revolve 

 in unison. 



The combs L and K, and 

 F'and H, have curved rods 

 L which pass round the 

 plates and support dupli- 

 cate combs in the rear as 



Figi 30_Atkinson's Four-Plate shown ill the Cuts. The 

 Topler Machine-End View. brusnes are algo duplicated 



as shown : so that with the exception of the Leyden 

 jars and switch, and parts connected with them, this 

 is practically a double machine. 



In like manner an eight-plate machine may be made 

 by doubling these parts of the four-plate. 



When the large Topler or Holtz machines are 

 wanted for constant use, the motive power is usually 

 supplied by a steam or gas engine, or a water motor. 



