ilar letters of referenceindicate corresponding parts in the several figures.H is the case of the instrument, I I is the key boardcomposed t>i a number of playing keys representing acomplete octave, more than is represented by thereeds, J J, or other equivalent devices for producingthe musical… … The fixed scale is shown in Fig. 2, lettered C C,°D D D5 E*, &c, corresponding with the denomina-tions of the notes of a complete octave the several
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