94 THE TILES ^ 



caust. One floor tile lias liad tlie edge bevelled all round 

 after firing biit for what purpose is not clear. 



Roof tiles include both, the large flat " tegulae " and the 

 "imbrices" in the shape of a half cylinder. Their arrange- 

 ment is shown in Fig. 2. The larger tegulae are about 

 18j X 14j inches and 1 inch thick. They are oblong in 

 shape, with a projecting ridge along each side which held 

 the imbrices in place. This flange is discontinued for 

 about 2 inches at the top of the tile so as to allow for the 

 overlapping of an upper row of tiles. Close to the top 



Fig. 2. — Roof Tiles.* 



edge of the tile is a square hole for the nail which held 

 the tile in position on the roof. On the under side the 

 roof tiles are scored with diagonal incisions to form a key 

 for plaster. The upper surface seems often to have been 

 washed over with a slip of finer clay which takes a some- 

 what deeper red than the clay body. The lower edge of 

 the tile is in several cases marked with an R roughly 

 inscribed with the finger or some blunt instrument. On 

 one fragment there is a V inscribed in the same way. 



* To show the arrangement of the tiles I have been glad to borrow the 

 scheme used by Mr. Ward, Gellygaer, p. 28. 



