The interior consisted of one large room divided by a row of columns. The interior walls were covered in wooden wainscoting probably to keep moisture from entering through the stone. Today, many examples of graffiti from as early as 1878 can be seen on these walls. Both magazines were built of the local sandstone which was quarried just to the right of the magazine pictured above. The magazines were virtually identical in design, however, while the first was very plain the second has elaborate sculptural decorations on all the columns and door.