Waggish professors in elementary physics never fail to put to their classes such a question as: "If a stone deaf man, alone on the moon, should shoot off a cannon, would there be any sound?" Ensnared students readily answer yes; should answer no.
Last fortnight the Medical Association of Vienna sat in their chambers, listened to Professor Stephan Jellinek, electropathologist, and Theodore Scheiber, electrical engineer, tell how an apparatus invented by them might make the answer yes. Their invention replaces normal acoustic hearing with electrical hearing, not dependent upon the functions of the...
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