Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1381
coilsshould 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… … Fig. 638post type insulator disconnecting switch
