Louis-Emile Durandelle, ‘Ornamental Sculpture from the Paris Opera House (Column Fragment)’, 1865/1874, National Gallery of Art, Washington, D.C.
sheet (trimmed to image): 27.2 x 21.1 cm (10 11/16 x 8 5/16 in.)  support: 63 x 44.2 cm (24 13/16 x 17 3/8 in.)  overall: 71.1 x 55.9 cm (28 x 22 in.)