Illustrated in the postcard in the basement foreground are cannon, one is displayed and another appears to be on the right in a recessed area with a ledge above. The middleground is another cannon with one opposite on the right en a recessed space with a ledge over it. In the background is a small door or perhaps there are steps leading down to the door. A picture is hanging on the wall left of the door, cannot distinguish what it is. The room appears to be a hallway with arches and ledges, pipes in the ceiling going to the left. The internet says the White Tower was used for armouries in the early years.