This is a catalogue of historical documents that portray just intervals as arc diagrams.
Please let me know if you know of more sources!

Click on an image below to see the whole catalogue of images from that source.



"De Institutione Musica" by Boethius (6th century, 15th century printing) [62 images]



"De arithmetica et geometria" by Boethius (6th century, 10th century printing) [1 image]



"Musica enchiriadis", unknown author (9th century, 10th century printing) [2 images]



"De harmonica institution" by Hucbaldus (10th century) [1 image]



"Micrologus" by Guido d'Arezzo (11th century, 12th century printing) [3 images]



"Speculum musicae" by Jacobus of Liege (14th century) [12 images]
(formerly attributed to Jean de Muris)



"Theorica musicae" by Franchinus Gaffurius (1492) [12 images]



"Dodecachordon" by Henricus Glareanus (1547) [4 images]



"Le Dimostrationi Harmoniche" by Gioseffo Zarlino (1571) [5 images]



"Musurgia Universalis" by Athanasius Kircher (1650) [7 images]