Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 361
ly handled. 227. The Arc Lamp.—With arc lights, the light appears betweenthe extremities of two carbon rods,which are kept at a slight distanceapart in air. The carbons are bothburnt away, though unequally, thatforming the positive terminal themore rapidly. To prevent the re-duction and extinction… … Fig. 221. Its simplicity depends chiefly on the fact that the lower carbon is fixed,but its position can be regulated by hand by means of themilled head (A), which, acting on a lever, raises or de- chap, vi.] Current Induction. 343 presses the lower carbon, which should be negative. Theupper carbon…
Electricity
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