Showing the “Impost” above Column, and Decoration.
TOMB OF GALLA PLACIDIA, RAVENNA
| DIAGRAM Showing How the Pendentives, Resting on Four Angles of a Square, Provide a Circular Base for the Dome. P. [205] | SECTION OF SS. SERGIUS AND BACCHUS, CONSTANTINOPLE Showing Fluted or Melon-Shaped Dome, Supported on Eight Arches and “Squinches.” Note Lights Round Dome. P. [206] |