La gnomonique pratique, ou l'art de tracer les cadrans solaires avec la plus grande précision, par les meilleurs méthodes, mises à la portée de tout le monde. Avec Des Observations sur la manière de régler les Horloges

Later edition, the original apparently published in 1755; with a frontispiece by Gazot engraved by Maniere, and 34 folding plates at end, engraved by Meunier, as well as a large folding map of France drawn by Bonne.
Contemporary marbled calf, decorated spine in compartments, red morocco title piece. Three corners bumped, a good copy.
Without doubt one of the best general treatises on sundials, perfectly illustrated and executed under the patronage of the Academy of Sciences by the learned and wise Benedictine monk François de Bedos de Celles (1709 - 1779). The great strength of this work is in its clarity of exposition and practice, which make it easy to apply its teaching both easily and precisely.