carbon lamp

carbon lamp

[′kär·bən ‚lamp]
(electricity)
An arc lamp with carbon electrodes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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But by 1878 he had cracked it, and gave a demonstration of his incandescent carbon lamp at a meeting of the Newcastle upon Tyne Chemical Society--and then many subsequent lectures across the country, including one at the Literary and Philosophical society of Newcastle, where more than 700 gathered to see his invention.
He turned his active imagination toward the incandescent carbon lamp and devised the method of "flashing" the filaments in a hydrocarbon so as to even them up by a deposit of carbon on the thinner places.
GE's and National's carbon lamps were considerably more expensive than those of some independent manufacturers, which means that GE made good profits through this arrangement.