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 systematic table and tabular technique described in Athanasius Kircher's comprehensive 1650 work on harmony, the Musurgia Universalis.