SECTION OF S. SOPHIA, CONSTANTINOPLE

Showing Pendentive Dome. P. 207. Small Diagram, at Right, Shows How a Dome Was Made to Rest on Eight Piers Enclosing an Octagon, by Niches or Squinches.

EXTERIOR OF S. SOPHIA

Showing the Immense Buttresses That Sustain the Thrust of the Dome. Minarets Added Later Are of Characteristically Turkish Type. [P. 207]