Œuvres complètes : Musique et mathématique vol. 20 - Huygens, Constantijn 1596-1687 (The Hague Nijhoff, 1940)
Christiaan Huygens, Lord of Zeelhem, (1629-1695) was a Dutch mathematician, physicist, engineer, astronomer, and inventor who is regarded as a key figure in the Scientific Revolution.
Huygens preferred meantone temperament; he innovated in 31 equal temperament (which was not itself a new idea but known to Francisco de Salinas), using logarithms to investigate it further and show its close relation to the meantone system.
Alternately contains "Christiaan" and "Huygens" as a watermark throughout the book
Keywords: 17th Century (1601-1700); 20th Century (1901-2000); Music theory; Science; The Hague (Netherlands)