Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 239
uiringbut a single electro-magnet, which is inseries with the arc.Such lamps as thismust be connected inmultiple arc across themains of the system,the potentialbeing con-stant while the current J=through each lamp mayvary according to itsresistance. As the arcbecomes longer, the in-creased… … ELECTRICAL ENGINEERING 237 kind the arc is usually enclosed within a small glass globewhich is nearly air-tight. The advantage of enclosing the arcis that the absence of fresh air—oxygen—prevents the carbonsfrom burning away as fast as they otherwise would. If the arcis not enclosed the carbons of…
Electrical engineering
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