Mechanical ?Court Martial? Arcade Automaton Diorama. Late 19th century. Mechanical diorama depicting a group of uniformed monkeys executing a dog in uniform, as a judge reads the warrant, and spectators weep in the background. 29 x 37 ? x 9 ??. Original gilt wooden ornamental frame, under glass; exposed clockwork mechanism and wiring on reverse. Light staining to diorama at left; scattered cracking and losses to frame. A rare early amusement.