Abacus Harmonicus, or Abacum Arithmetico-Harmonicum is a table and tabular method described in Athanasius Kircher's comprehensive 1650 work on music, the Musurgia Vniversalis.
Abacus Harmonicus, or Abacum Arithmetico-Harmonicum is a methodical system presented in Athanasius Kircher's extensive 1650 work on musical theory, the Universal Music.