Jackson, Thomas Graham, Sir, 1835-1924 · Cambridge : University Press · leaf 139
a narrow staircase winding * See Appendix to this chapter 2 From these squinch or obHque arches flying buttresses former y sprangto the dome. They were removed by Fossati when he put his iron girdle roundthe dome. v. Antoniades,Eic^paatf &c. Plate Kr. 92 S. SOPHIA, CONSTANTINOPLE [ch. vi The… … The effect of piercing these buttresseswith arches inthegallery floor and that below is to convert them into flyingbuttresses; and their strength depends on their abutment,which is the stair turret and the short respond walls of thegallery arches. Strange to say removal of plaster for thepurpose of…
