Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1375
should be used with lightning arresters except, when thearresters are used to protect cable systems. Three types of choke coils are shown in Figs. 639 and640. The 4,600-volt coil is made of insulated wire, woundon wooden core supported by iron feet. The 6,000-voltcoil is made of insulated wire and… … Fig. 638post type insulator disconnecting switch
