Tractatus Astrarii / di Giovanni Dondi dall'Orologio ; a cura di Aldo Bullo.

A book of medieval mechanical engineering intended primarily for students of astronomy, watchmakers and technicians. The modern sketches added at the end of the book allow readers to more easily follow what is written by Giovanni Dondi on the motions of the planets. Vol. 2 is a facsimile of the original manuscript.