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denser from an alternating-current machine of very low frequency, and preferably adjusting the discharge circuit so that there are no oscillations set up in it. We then obtain in the secondary circuit, if the knobs are of the required size and properly set, a more or less rapid succession of sparks of great intensity and small quantity, which possess
Fig. 1.—Discharge Between Two Wires with Frequencies of a Few Hundred Thousand per Second.
