Organum mathematicum libris IX. explicatum - Schott, Gaspar 1608-1666 (Würzburg Endt; Hertz, 1668)
contains an engraved portrait of Archduke Karl Joseph of Habsburg son of Ferdinand III, Holy Roman Emperor (between p. 10 & 11) who died in his early teens in 1664
Schott was a German scientific author and pedagogue, collaborator of the polymath Athanasius Kircher
Part 9 of the book is dealing with musical mathematics.
index
quo per paucas ac facillimè parabiles tabellas, intra cistulam ad modum Organi pnevmatici constructam reconditas, pleraeque mathematicae disciplinae, modo novo ac facili traduntur.
Keywords: 17th Century (1601-1700); Science; Germany