Saumur / Angers: F. de Gouy / Veuve Foureau, 1765.
1st Edition. Hardcover. 8vo - over 7¾ - 9¾" tall. Very Good. Item #003043
8vo (170 x 101 mm). 133,  pp., woodcut head- and tailpieces and initials. Includes unnumbered leaf at end titled "Supple?ment pour le page 83." 19th century half-calf over marbled boards, spine decorated and lettered in gilt, red-sprinkled edges, marbled endpapers (slight rubbing of extremities). Light even browning of text, very minor occasional spotting, clean tear at fore-margin of leaf F4, author's name added to title in manuscript. Provenances: Leon Leroy (bookplate to front-pastedown); Giancarlo Beltrame Library. ----
OCLC 690864207. EXEPTIONALLY RARE FIRST EDITION of this manual on time measurement by the French clockmaker Gabory. OCLC records but a single copy in public libraries (Université de Lille). The manual gives examples for various applications, such as setting of watches and clocks, sun dials and defining musical time using a thread pendulum. Gabory, on p.113 of his manual, says "On appelle vibration, le chemin que fait ce corps pesant pour se porter d'un côté à l 'autre de sa perpendiculaire; type que l'aller & le venir font deux vibrations" (Vibration is the name of the path that this heavy body travels to move from one side of its vertical to the other; so that the back and forth movement makes up two vibrations). - Visit our website for additional images and information.
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