[Sundials] Two works: (1) Knoop, J.H. Verhandeling van de sphaerische of klootsche zonne-wysers;

Namelijk, hoe men op een sphaera convexa, of ronde kloot, allerley zonnewysers meetkonstig beschryven kan. Leeuw., J.A. De Chalmot, 1761, (10),244,(8) p., w. 50 ills. on 21 fold. engr. plates by J.C. Philips, later hvellum w. use of older materials. Title-p. stained and a bit browned, w. stamps and label of the Capuchin Monastery in Antwerp. Otherwise a good, untrimmed and largely unopened copy. Bierens de Haan 2521; Houzeau & Lancaster 11656. Only edition of this important work on spherical sundials, describing how to measure and construct different types of sundials, for example inside a half hollow sphere, and a "gnomic" armillary sphere. (2) A.C. Hazewinkel, A.C. Handleiding om op verschillende wijzen de breedte buiten den middag of meridiaan te vinden, door waarnemingen aan de zon of starren. Gron., R.J. Schierbeek, "Gedrukt voor rekening van den Schrijver", 1827, 1st ed., 10,(44),66,(7)p., 1 fold. engr. plate. contemp. plain boards. Libr. stamp of "College Zeemanshoop" on title. Spine pasted over w. paper; sm. ticket on frontcover. Bierens de Haan 1943; Cat. NHSM p.687; Crone Libr. 807. Very rare first edition, a second edition appeared in 1839.

(total 2)