International Library of Technology · Scranton, International Textbook Co. · leaf 697
longer act effectively, andthis means practically anew carbon and cup, since they may be procured very cheaply.In the case of renewal of a large number of cups, they maybe returned to the manufacturer and recharged by him. 39. Carbon cylindei cells are a modified form of theLeclanche. Sal ammoniac… … Fig. 8. AXUSTUNCIATORS. 40. When a number of push buttons are installed, it isnecessary to have an indicating arrangement to show fromwhich button the bell is rung. The instrument used is 30 INTERIOR WIRING. 28 called an annunciator. One ordinary house style is shownin Fig. 9. On the face are rows…
Electrical engineering
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