Multilayer Coils with Square and Circular Section. 965 



whether the right end of the layer I (see fig. 2) is joined 

 directly to the right or to the left end of the layer II. It is 

 essential, however, for the treatment here given to connect 

 the layers consecutively — i. <?., to make the layer II the 

 direct continuation of the layer I, the layer III the direct 

 continuation of the layer II, etc. 



Fig. 2. — Inside structure of multilayer coil. 



o M 

 o I 

 o / 



Fig. 3. — Diagram showing position of layers in multilayer coil. 



Let now, more generally, ABCD (see fig. 3) be the cross 

 section of the coil. Let the horizontal lines such as Ej E 2 

 indicate the position of the layers. Let (1) and (2) be the 

 terminals of the coil. Since now 



(1) The spacing of the wires in each layer is constant, 



(2) The spacing between layers is constant, 



(3) The number of turns in each layer and the number 



of layers are large, 



(4) The e.m.f. induced in each turn is the same for all 



turns, 



it is legitimate to conclude that the e.m.f. induced between 

 the terminal (1) and the layer ExE^ is proportional to the 



area (1) CE^D (1). 



