Scientific American 389 May ii, 1907. THE TALKING SIREN OF DR. MARAGE. … a given individual may be able to perceive spoken Fig. 5.—An Apparatus for Teaching the Deaf How to Hear and for Massaging the Ear, words. In fact, many persons have a rather limited capacity of hearing ordinary speech but are able to hear distinctly either musical vibrations or noises. The reason…
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