Webster's Online Dictionary
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Definition: ABACUS HARMONICUS

Part of Speech Definition
Expression 1. (Mus.), an ancient diagram showing the structure and disposition of the keys of an instrument. --Crabb.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Extended Definition: ABACUS HARMONICUS


Abacus Harmonicus

Abacus Harmonicus was an ancient diagram which showed the structure and placement of the keys of a particular musical instrument.


Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Abacus Harmonicus". Image Credit.