Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 335
, however, he met with some practical difficul-ties, and then he formed the idea of having the imperfect con-tacts superposed in an incandescent lamp, in free air, and hav-ing the carbon pencils automatically renewed, according as theywore out For this purpose he uses several carbon rods, arranged… … Fig. 172. The arrangement indicated in figure 170 is only realizablewith very thin carbons in the transverse direction ; carbons ofround or square section take a wolfs tooth form (figure 171)which is unfavorable to the luminous effect of the apparatus, forthe points relatively cold which stand out…
Electrical engineering
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