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 237
e almost entirely tight by excluding nearlyall air, causes a carbon to last from 65 to 150 hours, andthe light is steadier; but the globe must not be hermeti-cally sealed or it will explode. A vent must be providedfor the excess of gas developed. Regulating mechanism 180. Fig. 98 is a diagram… … THE ELECTRIC ARC. (From photograph taken through smoked glass.) Showing the positive carbon with its crater, and the lower negative carbon with its point. 234 ELECTRICAL ENGINEERING 235
Electrical engineering
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