Verhandeling van de sphaerische of klootsche zonne-wysers [...].

8vo: [10]-244-[6] pp.; 21 pl. (some browning and dampst., plates untouched).

Contemp. half sheep, sp. paper on covers, flat spine (corners bumped, def. to cover papers, spine rubbed, head def.).

Rare first edition by the Dutch mathematician Johann Hermann Knoop (1700-1769) describing how to measure and construct different types of sundials, including one inside a hollow half sphere, and a "gnomic" armillary sphere. Ill with an engr. title vign. by J.C. Philips and 21 fold. engr. pl. Title in red & black.
Ref. Bierens de Haan 2521. - Houzeau & Lancaster 11656.
Prov. Ms. entry on flyleaf.