International Library of Technology · Scranton, International Textbook Co. · leaf 412
lamps,but instead of the ordinary T7-g-inch or ^-inchround carbons, they use f-inch or even larger. This resultsin a long life, but the large carbons are apt to cast objec-tionable shadows. Another scheme for securing long lifefor the carbons of open arcs is to use flat carbon plates,but this,… … Fig. 27. the appearance of all the lamps of this class. A is theframe carrying the lower carbon holders &, b and the globe 18 ELECTRIC LIGHTING. 45 >Sw/tCf?. X i i K ^ l/ne. J
Electrical engineering
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