CAPRA, Balthasar. Usus et fabrica circini cuiusdam proportionis, per quem omnia fere tum Euclidis, tum mathematicorum omnium problemata facili negotio resoluuntur, Bologna: typis H. H. de Ducciis, 1655, 2 parts in one volume, 4°, numerous diagrams (occasional light browning, light dampstaining to upper inner margin), modern boards. With 4 other works on related subjects. (5)