Jackson, Thomas Graham, Sir, 1835-1924 · Cambridge, University Press · leaf 144
east satisfactory part of the design is the greatlunette wall that rests on the upper arcade in the northand south arches of the dome. These arches, as hasbeen explained above, are in fact barrel vaults with asoffit of over 15 ft. The lunette wall is three feet thick,and contains 12 small… … S. SOPHIA—CONSTANTINOPLE Plate XV
