The lower church (see Fig. 571) is about 125 feet long, and is about 17
feet in height at the west end; but owing to a fall in the level of the
floor at the east end, the height of the vault at that end measures
about 4 feet more than at the west end. From the choir floor to the
floor of the lower church the height is about 19 feet 3 inches. In order
to obtain this height, the floor of the choir is raised about 3 feet
above that of the nave. The height of the choir from the floor to the
apex of the roof inside is 74 feet 6 inches.
The following are the entrance doorways to the cathedral--viz., a wide
double entrance doorway at the west end of the nave, and a south doorway
in the second bay from the west end. There are also north and south
doorways in the lower church, and a doorway from the landing of the
north stair to the lower church.
[Illustration: FIG. 577.--St. Mungo’s Cathedral.