Tiles are divided into various sorts, according to the purposes to which they are applied. Thus, Plain tiles are chiefly used for covering houses : and, by the 17 EDw. IV. c. 4, they ought to be 10 1/2 inches in length, 6 1/2 in breadth, and5-8ths of an inch in thickness. - Ridge-tiles are of a semi-cylindrical form, and, by the statute, must be 13 inches in length, and also 6 1/2 inches in breadth : they are chiefly laid on the ridges of houses. - Corner-tiles are first made flat, in the manner of plain tiles, excepting that they are quadrangular; the two sides forming right lines ; and their ends, arches of circles : previously to burning, they are bent on a mould, like ridge-tiles; and ought to be 10 1/2 inches in length, and of a convenient size, being generally placed on the corners of roofs.
There are many other sorts, known under the names of Dutch, or Flanders, crooked, pan-tiles, etc. : but as only those first-mentioned are at present employed for cleaning knives, etc. we shall merely add, that on importation, they pay a duty of 15s. 5d. per thousand.