2 works in one volume, 8vo (161 x 102mm.), old vellum, modern cloth folding box, binding lacking ties
The first work describes a reduction compass used for finding proportions between figures. The compas optique of the second work was used for taking terrestrial and astronomical observations. Two issues of the latter edition are noted: this copy conforms to one in Paris, Bibliothèque St Geneviève (Catalogue des ouvrages imprimés au XVIe siècle: sciences, Paris 1980, 1446); the other is represented by copies in the Bibliothèque nationale de France (V-19007 (2), digitised) and Harvard (Houghton Library, *FC5 Er776 594g).
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