i.o.inixc i-oR rr.i.r.i'iKKXi: cih'criis 



241 



leakage which nccessilatcd siK'cial pottin.u iiu'lhods. Because of the 

 economy of cast-iron loadintj coil cases, it was decided to continue 

 their use, but to increase their dimensions sufficiently to reduce eddy- 

 current losses in the case to a tolerable point. 



The air-gap type loading coils designed for the transcontinental 

 circuits, coded Nos. 549 and 550 for the phantom and side circuits 

 respectively, were more generally potted as phantom loading units 

 than as individual coils, and in such instances the cross-connections 

 between the phantom and side circuit coils were made inside the case. 

 Important advantages of this arrangement were that the leakage 

 losses during periods of low line insulation were greatly reduced as 

 well as the liability of wrong connections of windings during the in- 

 stallation work. Fig. 5 is a photograph of an installation of open 



Fig. 5 — Typical open wiru loading iiislallatioa 

 Showing four phantom group (3-coil) cases and nine individual coil cases 



