Gnomonica, oder Gründlicher Unterricht und Beschreibung, Wie man allerhand Sonnen-Uhren auf ebenen Orten künstlich aufreissen und leichlich verfertigen soll &c. Zum andermal aufgeleget und Mit nutzlichen Anmerkungen, wie auch Dem Andern Theil, vermehret,
WELPER, EBERHARD; JOHANN CHRISTOPH STURM

Nuremberg Paulus Fürstens 1672 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; [2]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 Contemporary vellum (Item ID: 0000550)

$3,500.00

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.

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