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 235
egative carbon is generally a little thinnerthan the positive one, in order to screen the light as littleas possible. For each type of lamp a candle power curveis established, showing the amount of light it will shed invarious directions. See fig. 97. Globes of clear glassreduce the light by about… … Fig. 97. tance (from 0-15 to 0 175 ohm per foot). They are made of graphite mixed with pure carbon derived from the destructive distillation ofgas-tar, bitumen, pitchor similar substances.After being ground andmade into a paste witha syrup, rods are formedfrom ^\ to f inches inthickness, and…
Electrical engineering
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