[Electric engineering.] . is required toburn all night, it is necessary to provide itwith two carbons, arranged so that when oneis consumed the other will start up. Fig. 26shows a Brush double-arc lamp for all-nightburning. This view shows the lamp with theglobe removed and with one pair of carbonsnearly consumed. As soon as the carbonrod a gets to its lowest point, the rod ^/starts II lift wLlfeeding, and the other pair of carbons areconsumed. In order to obtain a long life forthe carbons, some companies use single lamps,but instead of the ordinary T7-g-inch or ^-inchround carbons, they use f
[Electric engineering.] . is required toburn all night, it is necessary to provide itwith two carbons, arranged so that when oneis consumed the other will start up. Fig. 26shows a Brush double-arc lamp for all-nightburning. This view shows the lamp with theglobe removed and with one pair of carbonsnearly consumed. As soon as the carbonrod a gets to its lowest point, the rod ^/starts II lift wLlfeeding, and the other pair of carbons areconsumed. In order to obtain a long life forthe carbons, some companies use single 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, also, has the bad feature of giving poor lightdistribution. Fig. 26. 44 ELECTRIC LIGHTING. 18 46. Tlie Brush Arc Lamp.—The general appearance ofthis lamp is shown in Fig. 26, which will serve to illustrate. 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
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Keywords: ., bookcentury1900, bookdecade1900, bookidelectricengi, bookyear1902
