At Landguard Fort we have a room cut into the walls of the Fort in the late 1800s to construct a control/test room for the Submarine Mining instruments, batteries and shutter boxes. The casemated room was constructed using standard brick. The walls were then lined with wood, presumably to protect the delicate instruments.
Other bricks were laid (end on), single glazed bricks at regular intervals and rows right round the room. They were stamped on the ends (before firing) JENNINGS, POOLE, DORSET. Does anyone no the purpose of these bricks? Or seen them in other Submarine Mining rooms? Also has anyone come across any official documentation/picture which states rooms must be lined with wood? I have a sketch of a room at Fort Monckton, Portsmouth from the Illustrated London News 1880 but it’s a little on the fanciful side!
There was a picture but I am having trouble inserting it!