Pierre Bouguer's Optical Treatise on the Gradation of Light.
University of Toronto Press, 1961. First edition. 23.5 x 15.5 cm. Octavo. 248pp. 3 appendices. Frontispiece portrait. Bound in blue cloth, no jacket. Translated into English and with notes by W. E. Knowles Middleton. Spine is toned. Corners are bumped. Previous owner's bookplate on front fixed endpaper. More