International Library of Technology · Scranton, International Textbook Co. · leaf 519
showsan improved form of jack and plug that is used by theWestern Electric Company. It consists of a main jack Aand two smaller jacks B, B, which are used in making trans-fers. The springs a, b, b hold the plugs in place by engagingthe groove on the end of the plug. This plug also has ahard-rubber… … Fig. 34. 65. Ammeters.—An arc board requires comparatively-little auxiliary apparatus. A single ammeter is about all thatsome boards are provided with, but others, equipped on amore elaborate scale, are provided with an ammeter for eachmachine. This ammeter is in general the same as thoseused for…
Electrical engineering
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