My own design of a chiffonie, or symphonia, based on the miniatures of the Cantigas de Santa Maria of Alfonso X (1221-1284), king of Castille and Léon. This was my research project at the Sao Paulo University, in 2004. I am aware of the existence of an exact copy of my project from another luthier. Although the whole instrument is based in common knowledge, historical evidence and good sense, I believe a fair exchange of ideas may be more profitable than a copy. The measurements, and most important of all, the alterations that make this instrument now a good working possibility, are available to anyone willing to discuss the project. free.

source: http://www.pbm.com/~lindahl/cantigas/images/cantiga_4.jpg