Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 440
the inside of the bulb and interferewith the light. In time the bulbbecomes coated on the inside with alight-colored deposit, due chiefly toimpurities in the carbon; it shouldthen be replaced by a new one. Inan inclosed arc the gap may be muchlonger, without a rapid combustionof carbon, since the… … de-The arcsare the saving of carbon and thediminished cost of labor for trim-ming. An open-air arc is trimmednightly and an inclosed lamp, prob-ably once every ten days. 378. Alternating CurrentArcs.—In arcs fed from an alter-nating current there is not a con-tinuous flame, but the arc is…
Electricity · Magnetism
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