International Library of Technology · Scranton, International Textbook Co. · leaf 378
generalidea of the appearance of a direct-current enclosed arc.The student should compare this with Fig. 2. In theenclosed arc the carbons are separated by a wide gap, butthe principal difference is that they do not take on thepointed shape. The ends of the carbons remain nearly flatand the arc… … Fig. 6. soft and tinged with violet rays, having much less of thedazzling appearance so well known in connection withthe ordinary arc. In the alternating-current enclosed arc,the lower and upper carbons are of aboutthe same temperature and the light isthrown up more than with the direct-cur-rent…
Electrical engineering
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