Plan or picture viewer - has manual or auto picture turnover mechanism for piled pictures to bring to viewing window

摘要

Picture or plan viewing equipment enables pictures to be turned over individually from a pile and presented for viewing in a window. Along the small side of the equipment is an exit aperture for extracting the required picture. Alternative methods of moving pictures from bottom to top of the pile are described using manual or automatic operate bars. The top and bottom units of the casing are tensioned apart by spring pressure.