An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 631
lso used in long-distance radiotelegraphy. Thisdevice is shown in figure 420, in which we have a copper-carbon arc in an atmosphereof coal gas. The positiveterminal is copper, which ishollow and water-cooled.The negative A is carbon andis slowly rotated. The polesN and S of a powerful… … Gas Inlet Fig. 420. — Poulsen-arc generator. with a copper pipe carrying water for cooling the walls. Suchan arc can deliver several kilowatts of high-frequency power. •g O 55 q
Electricity · Magnetism
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