Title: DELAMBRE, Jean Baptiste. Autograph letter ...
Publication Date: 1810
Book Condition: Good
Signed: Signed by Author(s)
Autograph letter signed "Delambre" to Colonel William Mudge (1762-1820). 1 page, with integral address panel on verso (192 x 200mm). Written in French in black ink in a tight print (small hole of seal affecting some text, few weak folds, paper repair at right margin). Jean-Baptiste Delambre was a distinguished French astronomer; he was also director of the Paris Observatory from 1804. Delambre was one of the first astronomers to derive astronomical equations from analytical formulas and was the first to create a diagram of the northern triangulation from Paris to Dunkirk in 1791. For this research he depended much on dialogue from his contemporary Colonel William Mudge; noted mathematician and head of the Royal Military Academy in London. Delambre and Mudge's research overlapped on several expeditions over their careers, namely surveying France and measuring, or in some cases re-measuring, meridians. They were known to have both practiced the theory of plane trigonometry which employed reduced angles and chords. This undated, brief letter, with no formal address to Mudge, concerns distances and latitudinal measurements between Greenwich and Dunkirk and Greenwich and Paris. It is significant for marking the discussion between two very important pioneers of latitudinal and longitudinal distance. Bookseller Inventory # 6495
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