International Library of Technology · Scranton, International Textbook Co. · leaf 218
§ 16 ELECTRIC LIGHTING. 21 instrument and the one previously described is that an oillamp A is used as a working standard instead of an incan-descent lamp. The bar is also provided with a scale readingdirectly in candlepower, though the Willyoung instrumentcould also be provided with a…
Electrical engineering
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