William HUBER (1830-1895), geographer and civil engineer. Autograph manuscript signed, Mesures des hauteurs, [1875]; 27pages in-fol. with erasures and corrections, illustrated with 6 ink sketches. Important manuscript forming the 1st chapter (pp. 1 to 26, "Géographie physique") of Instructions générales aux voyageurs published by the Société de Géographie (Delagrave, 1875). Huber successively studies levelling, the Burel level, water level, levelling staffs, the bubble level, levelling books (with model in table form), measuring heights by barometer, barometer construction, the aneroid barometer, measuring heights by geodesic procedures...