Louis de CORMONTAIGNE (1696–1752)., Manuscript, *Theory of Mining*

This *Theory of Mining* comprises nine treatises, accompanied by their pen-and-ink drawings (most of which are coloured with watercolours), which were included in the posthumous edition of the *Mémorial pour l’attaque des places* (1803). A note on the drawings for the 9th Treatise states: ‘The 9 treatises enclosed herewith belong to Mr le Cher de Perthuis’. 1st Treatise, 8 September 1724; a note states that ‘the theory contained on this page and the following one is by Mr de Vallière’; with 2 watercolour plates. 2nd Memoir, same date: ‘General application of the Theory of Mines, for undermining covered roads’. 3rd Treatise, dated November 1725, ‘Continuation of the Theory of Mining’; with 7 watercolour plates. 4th Memoir, 10 December 1725; with one watercolour plate. 5th Treatise ‘On a layout of galleries and tunnels by means of which one can remove, all at once and as many times as one wishes, the same section or surface of an earthwork’, dated at the end of Metz, 25 February 1740; with 4 fold-out watercolour plates. 6th Treatise; with 3 plates. 7th Memoir, ‘System of Mines applicable to the defence of fortifications’; with 2 plates. 8th Memorandum by M. de Rozieres, 26 November 1739; with 6 plates. 9th Memoir (4 folios), 23 October 1740, ‘On the layout of suitable counter-mine galleries in the entrenched counter-works of Landau’; with 4 watercolour plates, 2 of which are fold-out. This is followed by the ‘List of the names of the tools used to construct the counter-mine galleries of the double crown at Belle Croix in Metz’. Attached is a manuscript: ‘Extracts from a Memoir by Mr de Cormontaigne on the attack and defence of fortifications’ (2 folio pages), with 4 pen-and-ink plates.

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