Revisiting the Geometry of the Transition Zone Using Filposh Squinches in Ardeshir Palace

Iranians invented squinches to cover a square-plan space with dome. Filposh, type of squinch first found in Sasanian architecture, is conical vault constructed the transition zone’s corners transmit dome’s forces and weight. This technique can be seen three halls palace Ardeshir. In this paper, geometry zone using filposh between spherical dome square supporting walls Ardeshir Palace was re-examined. A historical descriptive method employed analyse main drawings from nineteenth century present, two hypotheses concerning were modelled evaluated. As result, hypothesis that cross-section intersects chamber’s plan rejected. Furthermore, claim circumscribes discussed proven.