circulus manualis

circulus manualis (manus) Bezeichnung für die auf der Guidonischen Hand spiralförmig angeordnete Tonreihe — term that signifies the spiraling arrangement of pitches on the Guidonian hand [s.XIII] LmLMus. man. 30, 15: Istae siquidem duae notae fa et mi ... semitonium in nostra musica constituunt. Reperitur autem septies in circulo manuali, videlicet inter ⋅B⋅ et ⋅C⋅, inter ⋅E⋅ et ⋅F⋅, inter ⋅a⋅ et ⋅b⋅ mollem, inter ⋅C⋅ quadratam et ⋅c⋅, inter ⋅e⋅ et ⋅f⋅, inter ⋅⋅ et ⋅⋅ mollem, inter ⋅⋅ quadratam et ⋅⋅ superacutam. [s.XV] LmLFr. Gafur. extr. 6, 4, 5: consonantiarum notitia habetur in circulo manus. Nam in toto circulo manus simplicis 19 tactus reperiuntur, videlicet gama ut, ⋅a⋅re, ⋅♮⋅mi etc. usque ad ⋅e⋅la exclusive, quia ⋅e⋅la non ponimus nisi necessitas requirat.