International Library of Technology · Scranton, International Textbook Co. · leaf 518
strates the style of plug used on Brush arcboards. It will be noticed that pains are taken to securehigh insulation. A is the marble panel and b the metalplug, or contact, attached to the cable as shown. C is acup-shaped casting to which the line is connected and intowhich b slides and is held, so… … Fig. 33. a maple handle; h is a spiral spring that causes the sleeve Fto slide over the contact piece b when the plug is pulledout, so that by the time the plug is pulled entirely out ofthe board, the contact b is completely covered and there isno danger of the attendant coming into contact with…
Electrical engineering
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