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n.1.An instrument for producing music (Tel*har"mo*ny [ ]), at a distant point or points by means of alternating currents of electricity controlled by an operator who plays on a keyboard. The music is produced by a receiving instrument similar or analogous to the telephone, but not held to the ear. The pitch corresponds with frequency of alternation of current.
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Manning precedes the first chapter with background information on activities and developments from the turn of the century to 1945, describing some initial attempts at electronic sound generation, including such exotica as the Dynamophone (measuring in at 60 feet and 200 tons) and the Givelet (a precursor to the Hammond Organ), as well as the more familiar and established ondes martenot and theremin.