112 ELEMENTS OF STATIC ELECTRICITY. 



object, connected with their outer extremities. As this 

 induced current flows simultaneously with the direct 

 current from the inside coatings, the switch and sliding- 

 rods place it completely under control of the operator. 



3. The brush holders, E and F, are attached to the 

 plate B, through holes near its edge ; thus giving a di- 

 rect passage to the electricity from the carriers on the 

 plate A, where it is generated, through the glass, to the 

 tin-foil inductors, represented by the dark shade, and 

 the paper inductors T and X, represented by the light 

 shade. By passing the electric charge through the glass, 

 inside its edge, an insulating margin is interposed be- 

 tween the conductors and the edge, thus preventing 

 loss from leakage, which is unavoidable when the brush 

 holders are attached by clamps or ears on the edge. 



4. The carriers on the plate A are of sheet brass, 

 with raised centers, and are nickel plated, making them 

 both durable and ornamental. The hard nickel surface 

 is not affected by the action of the brushes, or the elec- 

 tricity, while tin-foil soon becomes defaced: and the 

 carrier, being practically one piece, and its entire sur- 

 face cemented to the glass, its raised center cannot be- 

 come detached, as may happen when the center is put 

 on separately over a tin-foil base. 



5. The combs V and K, also H and L, radiate at an 

 angle of 45 degrees to each other, from the central disc 

 M, to which they are attached ; so that any possibility 

 of error in regard to their position, or of displacement, is 

 practically impossible. 



The following improvements may also be noticed: 

 The base is made of two-inch strips, glued together 



lengthways, and heavy cleats screwed on underneath ; 



giving all the advantages of iron as to freedom from 



