THE THERMO OR BATHS.
105
the main entrance and the central block was a triple service corridor
(see Blouet), 58 feet wide, which was lighted and ventilated by cir-
cular openings at the top, these probably covered over by bronze
gratings. Similar vaulted corridors were carried on each side of the
central block to the farther end of the enclosure, with cross corridors
to the open courts and other halls where service was required in
the central block. These and vaulted chambers for stores of various
Fig. 29.—Details of an Octagonal Domed Room in the Baths of Caracalla.
kinds occupied a considerable portion of the artificial platform
and at a still lower level ran the outfall drainage system. Corridors
for storage also ran under the north-western annexe along
the south-west front of the main building (where three of them run
side by side) and along the front of the peristyle which surrounded
p
105
the main entrance and the central block was a triple service corridor
(see Blouet), 58 feet wide, which was lighted and ventilated by cir-
cular openings at the top, these probably covered over by bronze
gratings. Similar vaulted corridors were carried on each side of the
central block to the farther end of the enclosure, with cross corridors
to the open courts and other halls where service was required in
the central block. These and vaulted chambers for stores of various
Fig. 29.—Details of an Octagonal Domed Room in the Baths of Caracalla.
kinds occupied a considerable portion of the artificial platform
and at a still lower level ran the outfall drainage system. Corridors
for storage also ran under the north-western annexe along
the south-west front of the main building (where three of them run
side by side) and along the front of the peristyle which surrounded
p