[MANUSCRIPT - SUN DIALS]. "Traité De Gnomonique. Premiere partie [-Seconde partie] [-Troisieme Partie]." [Paris]: 1700.

3 parts in one volume, 8vo (194 x 130 mm). Premiere partie: 54pp. comprising text and diagrams; 8ll. longitude and latitude tables tipped in, printed on one side only (printed 1716). Seconde partie: 72pp. comprising text and diagrams. Troisieme partie: 61pp. comprising text and diagrams. (Some dampstaining to upper margin.) 20th-century red morocco-backed boards gilt.

Part one contains an introduction to the science including practical aspects of geometry and tables to assist in the construction of sun dials. Part two includes information about the construction of several types of sundials, with descriptions about arcs and lines. The third part contains the description of several portable sun dials for the sun, moon, and stars.

Though the manuscript is dated 1700, printed tables laid in are dated 1716. The manuscript comprises an extensive treatment of sundial theory, geometry, and the construction and application of different cadrans. It is generously illustrated throughout with accurate finely executed drawings. The second part includes information used for determining different times of the day, such as the Italian and Babylonian hours for sunrise and sunset. "Men well versed in mathematics and astronomy seem to have felt it their duty to acquaint everyone with the theory of constructing dials. It was all so simple that even the uneducated peasant should know how to build his own sundial...the dial became a scientific instrument, more dependable and lasting than any mechanical device." (Newton & Mayall, Sundials, p.19).

Selections from the Property of Dr. Eugene Vigil, Antiquariat Botanicum