50 15th Century, translation in:  Dimitri Conomos, ed., The treatise of Manuel Chrysaphes, the lampadarios... (Mount Athos, Iviron Monastery MS 1120, July 1458), MMB, Corpus Scriptorum de re musica, II, (Wien: Verlag der Österreichischen Akademie der Wissenschaften, 1985), pp. 48-67.