Titre : Historien af Mr. Harrisons forsög til ...
Éditeur : Kiöbenhavn: Trykt hos Nicolaus Möller? 1768.
Date d'édition : 1768
4to, 66 pages, 9 engraved plates (7 folding) with 9 leaves of explanation, 1 leaf (instructions to the binder). Woodcut head- and tailpieces. Contemporary half sheep and speckled boards (foot of spine and lower corners a little worn, short crack at foot of lower joint), morocco label and old paper label on spine. A clean and fresh copy. Old stamp ?A. St. B.? in lower corner of title. FIRST EDITION IN DANISH of the technical report on Harrison?s chronometer, the first time-keeper to be both sufficiently accurate for the purpose of navigation and able work on a ship. It brought about a revolution in navigation, as navigators were for the first time able to calculate, as opposed to estimate, their longitude. This was the first time that a navigator was able to establish his position anywhere at sea, and remained the only method until the introduction of the Global Positioning System in 1994. The Commissioners of Longitude demanded a demonstration and a full account of the mechanism of the chronometer H4, which were written respectively by Maskelyne and Harrison himself and published as the present work. The plates are extremely accurate representations of the mechanism. This and the French edition seem to be the only contemporary translations. This edition is particularly rare (3 copies are recorded in OCLC, in the national libraries of Denmark, Sweden and France). See Printing and the Mind of Man 208; Parkinson, Breakthroughs, 1765; Grolier One Hundred (Science), 42b; and Norman catalogue 995. Andrewes (ed.), The quest for longitude, p. 251, etc. N° de réf. du libraire 2817
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