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 512
over acoal fire. After a direct-current arc has existed for a little time be-tween the carbon points, they come to look very much as theydo in figure 320. Both points become very hot and give offlight, but the positive point (which is the upper point in thefigure) becomes much hotter than the… … Fig. 320. — Electric arc pro-duced by direct current. 458 ELECTRICITY AND MAGNETISM point. The positive point, therefore, becomes a little hollowedout on the end, as shown in the figure. This hollow is calledthe crater of the arc. As the greater part of the light of the direct-current arccomes from…
Electricity · Magnetism
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