196 



ALTERNATING CURRENTS 



are usually built up with rectangular strips, the joints of which 

 butt, in the individual layers. However, the joints lap in alter- 

 nate layers, as indicated by Fig. 183 (6), which shows the arrange- 

 ment of joints in two adjacent layers. When a large number 

 of transformers of a single type are being manufactured, the 

 laminations are often made of L-shaped stampings stacked so 



FIG. 183 (a). Arrangement of coils 

 and core in a core-type transformer. 



FIQ. 183 (&). Arrangement of joints 

 in adjacent lamination layers. 



FIG. 183 (c). Coil and core assembly of Wagner core-typo distribution 

 transformer. 



that the joints alternate. Figure 183 (c) shows a core-type 

 transformer assembled, with leads, etc., but without the case. 



If a transformer were made with the primary and secondary 

 coils on separate legs, as indicated in Figs. 170, 172, and 173, 

 an unsatisfactory transformer would result, as the large leak- 

 age flux for both primary ancl secondary would give very 



