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A telegraph in which the letters of the alphabet or figures are placed on a circular plate in such a manner that they can be brought to succession to an opening, or indicated in sucession in some other way, as by a pointer.
GalleriesTelephone and Telegraph Industry
William & Robert Chambers Encyclopaedia - A Dictionary of Universal Knowledge for the People (Philadelphia, PA: J. B. Lippincott & Co., 1881)
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