APPENDIX. 



347 



the screws of the two pillars at the front end of the 

 machine, cp. Fig. 3, then the current of the primary 

 circuit is rapidly made and broken, and a corre- 

 sponding number of induction shocks produced in the 

 secondary coil. The method in which the primary 

 current is made and broken will be easily understood 

 from the figure. When the current is passing in the 

 primary coil, (6) is in contact with (c), but since the 



FIG. 3. 



current also passes round the coil (m) the soft iron 

 core of this coil becomes magnetized, and conse- 

 quently attracts the plate (e) ; as this goes down the 

 contact of (6) and (c) is broken, hence the current 

 ceases to pass in the primary coil, the core of (m) 

 is no longer magnetized, the plate (e) flies up, 

 (6) comes again in contact with (c) and the cycle 



