Encaustic tiles were made here in the fourteenth century, and the kiln in which they were fired, and a vast number of unfinished tiles and fragments of tiles, were discovered in 1866. The site of the tile works was within the old abbey walls, and was accidentally brought to light by the boys of Repton School, who were busying themselves in levelling a piece of land for their cricket ground. During their work they came upon patches of a stiff red clay with fragments of tiles; and, presently afterwards, found some regular layers of them, face downwards. Next they came upon masses of brickwork, which, upon careful clearing, turned out to be a kiln for the firing of the tiles. Of this, and of the tiles found within and around it, I made careful measurements and drawings, and some of these are shown on the accompanying engravings.[36] The kiln, Fig. 119, consisted of two series of arches (each series consisting of six arches alternating with the same number of openings) over what may be termed two vaults, each 7 feet 6 inches long, by 2 feet 6 inches wide, and about 1 foot 10 inches in height. The arches were formed of chamfered bricks or tiles, those composing the actual arch measuring 7¼ inches in breadth at the square, or upper end; 2¾ inches in breadth at the lower end; 7¼ inches in length; 4½ inches in length on the square sides; 3½ on the chamfer; 1¼ inches in thickness at the upper end: and three quarters of an inch in thickness at the lower end. The basement, four inches in thickness, was formed of bricks or tiles. Upon this were built up, at distances of 4½ inches apart, the chamfered bricks from which the arches sprung, these being placed broadends together and so forming an hexagon. Between these the remainder of the wall, to a level with the top of the arches, was formed of encaustic tiles, which being 4½ inches square exactly fill up the width. These encaustic tiles, some hundreds in number, were of various patterns, but evidently unfinished, being quite soft and pliable. The floor of the vault was paved with tiles, and at the entrance was a stone wall on either side, and against the wall-pier was placed the curious relief tile, Fig. 120. [Illustration: Fig. 120.]