Nuremberg: Paulus Fürstens, 1672. Contemporary vellum. 4to(18.0 x 13.7 cm) 2 parts in 1 vol. Contemporary vellum on stiff boards. Plain spine. Soiling to spine and boards. Collation: [xii], 88pp.+17 (1 duplicate) engraved plates and engraved frontispiece; 3-74pp. with text table: Tabula Inscribendae Horologiis Dierum Lonfitudinis. In this two part work Welper in the first part of this two part work describes the process and illustrates details for quadrant and instruments for measuring circle of declination. The second by Sturm provides additional mathematical information and instructions in use of horizontal and vertical dials. Very Good. Item #0000550
Both Sturm and Welper were Swiss mathematicians; Sturm more notable as teacher of as teacher of Johann Gabriel Doppelmair who was responsible for works on astronomy, cartography, and sun dials. Dopplemair also translated a number of texts into German from original Latin, making them more accessible to wider audience in Germany.