Philosophical transactions of the Royal Society of London (1699)
Royal Society (Great Britain) · London : Royal Society of London · leaf 104
Propor- tion as before) and interpofe che middle Number 3. And, of thefe Three Numbers, 4, 5, 2, that of 4 to 5, is the Pro- portion for a Fourth (or Déa-tefferon.) And that of 3 to 2, the Proportion for a Fifth (or Dia-pente.) And thefe Two put to- gether, make up that of an Octave (or Diapafen,)…
Internet Archive · Natural History Museum Library, London · Public domain (published before 1931). Free to use for anything.
