s. The "acoumeters" previously constructed for the pur- pose may be divided into three classes, producing re- spectively noises, musical vibrations, or the vibra- tions of spoken words. The first two classes will obviously give only a faint idea of the way in which a given individual may be able to… … they are not only recognized by the ear but give the Fig. 6.—Two Sirens, One with a Complete Set of Mouthpieces. same graphical records as natural vowels or the vow- els produced by a phonograph. However, they corre- are absolutely identical with those of natural spoken by it is that the intensity…
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