PORTION OF THE SUPERSTRUCTURE IN THE PRINCIPAL GALLERY.
PORTION OF THE SUPERSTRUCTURE IN THE PRINCIPAL GALLERY.
PORTION OF THE SUPERSTRUCTURE IN THE PRINCIPAL GALLERY.
A A. Walls of brick, dividing the different bays of the gallery.
B B. Arches of construction, to make the brick facing adhere better to the mass of tufa concrete behind it.
C C. A void space from which a pier of travertine has been carried away for building purposes[249].
D D. The great pier of travertine on one of the arches of the corridor of the Flavian Emperors.