[42] Abstracted from Comptes Rendus, June 11, 1894, and communicated by Dr. Oliver Lodge.
[43] Why two years ago? It was practically proved by Savart early in the century, and has been observed over and over again since. However, it is true that experiments have been more numerous and conclusive of late, and have been pushed to very high frequencies.—O. J. L.
Transcriber’s Notes:
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