Psaltery: There are many different shapes in which the psaltery is found. Over time the shape evolved, with as latest developments the pig's snout shape, like the picture on the title page, and the wing shape (Picture from Ala Bohemica)
Found an archive of the original site this image came from. From that page, the original source of this image should be the Pasionale of Abdis Kunigunde, 1319-1321.
Psaltery: There are many different shapes in which the psaltery is found. Over time the shape evolved, with as latest developments the pig's snout shape, like the picture on the title page, and the wing shape (Picture from Ala Bohemica) Source: [http