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Scientific American, Vol. 84, No. 21 (1901) (1901)
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traverses them is suffi- ciently modified to produce in the disk vibrations that are probably very feeble, but perceptible to the ear. The radio-conductor must, however, undergo certain modifications in order that its sensitiveness may reach a maximum, and the form that has therefore been finally… … Fig. 1.—GENERAL VIEW OF THE POPOFF-DUCRETET long, and that correspond to the signals of the Morse TRANSMITTER, © 1901 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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