International Library of Technology · Scranton, International Textbook Co. · leaf 433
bon thatcannot be fed down. This, however,does not involve any waste, as thelength of upper carbon left over issufficient for use as a lower carbonwhen the lamp is retrimmed. Series constant-current enclosed-arclamps of the types just describedusually operate at 6.6 amperes with avoltage of about… … 66 ELECTRIC LIGHTING. 18 73. Series Alternating--Current Enclosed-Arc Lamps. These need no special description, as their principle of opera-tion is exactly the same as the direct-current lamp. Theyare nearly always of the differential type, and the maindifference is in the few constructional…
Electrical engineering
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