[Militaria] 'Etude de diverses parties de l'art de la Guerre

De J. Sengy Sr. Lieutenant au Corps Royal d'Etat major aide Major au 2eme Régiment de Grenadiers à cheval de la Garde. Janvier 1820.' 155 p. (last few p. blank). Fascinating French manuscript covering diverse topics, mostly related to military matters, incl. a.o. fortification, the use of compasses, mechanics, hydrostatics, hydraulics, "plan d'un pont volant", the distances of the planets to the sun (w. hand-drawn diagram), artillery (for canons and for the army) and the construction of siege batteries. Incl. many in-text hand-drawn (and some handcol.) diagrams, drawings and tables as well as 6 hand-drawn (some handcol.) fold. plates. Written in a clear, legible hand. Bound in sl. later (somewhat worn) marbled paper over boards. Sm. 4to.

Joints sl. worn, but bookblock holding on cords. A remarkably clean manuscript, truly a unique work.