The Maxim Electric Light and Power Co., Philadelphia. . ,la ne Arc La EST* w \ THE UNITED STATES ELECTRIC LIGHTING CO. 13 The lamp shown at the left, on page 12, is a plain, open-frame Weston lamp. At theright is shown a duplex lamp. In this there are two sets of carbons so arranged that, when the first set is consumed, the secondset is automatically brought into operation.

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1882