Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 193
only one carbon may be nsed at a time,hy so using one only at a time the life of a manufactured lampis practically doubled, for where one carbon has reached its effec-tive limit, tlie circuit through it is transferred to the other,thus saving the expense involved in sealing one carl)on in itsglobe,…
Electrical engineering
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