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From newsletter 6:
9 HENNERT, Johann Friedrich Dissertation sur les moyens de donner la plus grande perfection possible aux lunettes, dont les objectifs sont composés de deux matières, qui a remporté le prix proposé par l'Académie Royale des Sciences et Belles-Lettres pour l'année 1771, adjugé en 1772. Berlin, Chr. Fr. Voss, 1773. 28 x 21 cm. Old marbled boards. (4), 58, (2) pp. Nice vignette on p. 3. First edition. Bookblock loosening a bit from covers. Some small notes and arithmetic scribbled (1800’s) on last endpapers. A bit browned.
€ 100
* Technical essay mainly about lenses for telescopes, which sort of glass to use and how to grind and position them. Many mathematical formulas. Foreword about the Royal Academy prize. With a folding table (see picture). Hennert (1734-1813) was professor of philosophy and mathematics in Utrecht.
