Full text: Volumen secundum. Opera geometrica. Opera astronomica. Varia de optica. (2)

NOVUS CYCLUS HARMONICUS. titudinis, quæ latitudo ſit {1/5} palmulæ vulgaris, deinde ſuper-
imponendus erit abacus mobilis, cum claviculis in inferiori
parte ſingularum palmularum fixis; ſemel ita diſpoſiti hi ut
chordæ, quæ in quavis octava adhibentur, ſonent, omni-
bus tranſpoſitionibus inſervient. Quæ ergo fient ſine labore
per tonos, ſemitonos, & uſque ad quintas partes tonorum; & certum eſt, omnes tonos & conſonantias in ſingulis tranſ-
poſitionibus æque accuratas eſſe, quod utile & amœnum erit. Olim Pariſiis conſtrui curavi, tales abacos mobiles ſuperim-
ponendos abacis vulgaribus Clavecymbalorum tranſpoſitio-
nibus plurimis, licet non omnibus completis, inſervientes; quod inventum approbarunt & imitati ſunt periti in muſicis
varii.

Sed ut quis certus ſit de veritate illorum, quæ ſuperius
dixi, inſpiciat Tabulam ſequentem cujus contenta ut & uſum
explicabo.

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