Large Octavo, 164 pages. In Very Good minus condition. Bound in full blue cloth, with gilt titling to spine. Cloth shows slight wear overall, and minor fraying to tail of spine. Text block has light offsetting to leaves at the front and rear, and binding beginning to split between pages 66 and 67. Two fold out plates at rear. Text in French. Ampère's magnum opus, this work is the founding treatise of electrodynamics. Shelved in Case 10.