International Library of Technology · Scranton, International Textbook Co. · leaf 698
Fig. 9. the openings … 41. The needle annunci-ator. Fig. 11, is a style muchused in hotels and for eleva-tors. The current on passingthrough the electromagnet ofan indicator attracts a pivoted,iron armature carrying a pointer P on the outside dial,causing it to set in an oblique position, in which it is heldby a catch…
Electrical engineering
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