"The Queen's Hospital for Facial Injuries, Frognal, Sidcup - the dental mechanics' class" image: The interior of a classroom, with a line of eight male dental mechanics wearing white gowns sitting side by side on stools at a desk by the window, which is on the right. Another man in a white gown stands behind the rearmost student. On the left is a long table upon which a bottle, some equipment and various bits of clothing are scattered.