Electricity one hundred years ago and to-day (1894)
Houston, Edwin James, 1874-1914. [from old catalog] · New York, The W. J. Johnston co., ltd. · leaf 68
th insulatingmaterials, so as to exclude all air. The non-observance of thissimple rule in the construction of commercial coils, is responsiblefor the destruction of many an expensive coil. At the stage when the steaming discharge occurs, or withsomewhat higher frequencies, one may by approaching… … Fig. 7.—Brush and SprayDischarge. brush—each spark or thread possibly corresponding to one alter-nation. This, when produced under proper conditions, is probablythe most beautiful discharge, and when an air blast is directedagainst it, it presents a singular appearance. The spray ofsparks, when…
Electricity
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