1851 Great Exhibition: Official Catalogue: Class X.: Forster and Andrews
From Graces Guide
562. FORSTER and ANDREWS, Hull — Manufacturers.
Original model of the transposing organ, which enables the performer to change the pitch of his instrument five semitones higher or lower from a given pitch, by an easy turn of a small key. The manuals remain stationary.
[The method generally employed by musicians when transposing (i. e. changing the key of) a piece of music, is to suppose it written in another cleff, e. g. original key [diagram excluded] key required D, suppose the music written in the alto cleff [diagram excluded] and the note indicated becomes D. —H. E. D.]
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