Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 400
bons, heats internally the vertex of anangular piece of marble placed on the bottom or side of theblock, and the luminous rays are projected in a very openconical sheaf, either downward, as shown in fig. 226, or side.ways, when the open part of the piece of marble is placed onthe side of the block.… … Fig. 226. destroyed and the arc is formed. The light is produced asmuch by the arc itself as by the incandescence of the marble,which is transformed into hme by the heat of the arc. The diagram, figure 227, shows the connections for workingthe lamp. A wire from the machine goes to the smgle block…
Electrical engineering
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