1851 Great Exhibition: Official Catalogue: Class X.: Robert Snell
From Graces Guide
528. SNELL, ROBERT, Ball's Pond — Inventor and Manufacturer.
Seraphine, with bichromatic or double scale of notes, producing perfect harmony in every key, without the aid of temperament; the improvement effected by an octave of pedals, one being put down, corrects the scale for the key required.
[That the musical scale cannot be perfectly tuned on instruments with fixed sounds, is a fact that can only be stated, within the limit of a note; temperament signifies the equal adjustment of the imperfection of the scale on an organ, or similar instrument.—H. E. D.]
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