First Latin edition of two important mathematical treatises by Ludolf van Ceulen (1539-1610) both translated by Van Ceulen's pupil, Willebrord Snell (1580-1626). There are at least three and perhaps more issues of the present edition. Apparently with all leaves ever present in this issue, whereas most copies lack one or more. The present Van Colster issue is clearly intended for the Dutch Republic and its supporters while the Van der Marsce issue is clearly aimed at the Spanish-controlled Southern Low Countries and its supporters. The Marcus issue is more neutral.
With a 1639 inscription on an endleaf. With some manuscript notes and calculations in at least two early hands, some struck through. Some ink stains. In good condition. The binding is dirty and some of the sewing supports broken at the joints. Simoni C-86 (STCN indicates this copy lacks title-page and preliminaries); STCN (3 copies, each apparently lacking some leaves present in ours); cf. Bierens de Haan 840 (Marcus issue).