Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 471
apour and heated air, is thus produced, through whichthe current continues to flow. Since this medium has a higli resistance,intense heat is developed and the carbonpoints become vividly incandescent andburn away slowly in tlie air. When adirect current is used, the point of thepositive carbon… … Fig, 555.—The arc light. 545. The Inclosed Arc—The Arc-light Automatic Feed. The open arc is now being largely superseded by theinclosed arc, a form in which the carbon points areinclosfed in .a glass or porcelain globe with an air-tightjoint at the bottom (Fig. 556), and with but sufficientopening…
Physics
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