all adhering more or less closely to the norm, with subsidiary courts, and chambers at either end to fill up the space. When we come to structural details, the materials are sadly lacking. Either the buildings are too much ruined to afford the necessary information, or the photographs which have been taken are insufficient.[262] Those given by Brünnow and Domaszewski are the best. From them, and from the reconstruction of Schultz, it is possible to see that the vaults oversail the walls[263] and that they are built of a double slice of tiles laid vertically, parallel to the main axis, so as to dispense with centering. The only photograph of a doorway which has been published[264] shows a relieving arch constructed of the same double slice of tiles, with place for a lintel below it. Schultz was able to determine that the lintel was composed of a wooden beam carrying a straight arch of stones. The straight arch occurs at Ukhaiḍir, but without the support of a lintel. The relieving arch has the form of the brick arches at Ṭûbah, a stilted and slightly pointed oval, and from the photograph it would seem that it was set back from the face of the jambs below the lintel, but Schultz in his reconstructions gives it the same width as the door opening.[265] Brünnow and Domaszewski reconstruct the doorways in the domed chamber without lintels, and the doorways in the small chambers of one of the baits without arches--that is to say, they are arch-shaped, but the arch is merely cut out of the solid wall. Schultz places lintels and relieving arches over all the doors. _Kim belir?_ The windows are small and round-arched. The closets were in the towers as at Ukhaiḍir, and Schultz in one of his drawings[266] places over the niche a fluted semi-dome. We know no more.