FR1CTIONAL ELECTRICITY. 



41 



CHAPTER IV. 



APPLICATION OF FRICTIONAL ELECTRICITY. 

 APPARATUS REQUIRED, AND METHOD OF USE. 



IT would indeed be a work of supererogation to enter into a 

 minute detail of the form and appearance of instruments so well 

 known as the Electrical Machine and its appendages. We shall 

 therefore simply confine ourselves to a few remarks concerning 

 the apparatus most adapted for medical purposes. 



The machines employed for medical purposes should have 

 sufficient power to furnish a constant stream of strong sparks ; 

 for in many cases, as will presently be seen, an application of 

 that kind is essential. If it be a Plate Machine, as represented 

 Fig. 1, the diameter of the plate should not be less than from 



fig. 



