Acoustic telegraph

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a telegraph making audible signals; a telephone.
See under Acoustic.

See also: Acoustic, Telegraph

References in periodicals archive ?
Following the success of the harmonic telegraph, Bell developed an acoustic telegraph (one that transmitted vocal notes) and embarked upon a patent race with Elisha Gray, who was working on an acoustic telegraph that relied on a water transmitter.
The motivation for inventing the phonograph was the desire to record messages from acoustic telegraphs and telephones, and Edison initially used a paper-indenting mechanism from an early telegraph invention.
He had been working on acoustic telegraphs to transmit musical tones telegraphically, which one of his patents called a "telephonic telegraph apparatus.