The clearstorey windows are actually larger than those of the aisle below, and are again rather acutely pointed for late work. They are of five lights, and the two mullions in the middle are carried up through the head, but a sub-arch comprises the two outer lights on either side. The last window eastwards is of three lights, is shorter than the rest, and has several transoms in the tracery. In the parapet, the coping is not carried down the sides of the battlements as it is on the aisles, and the rudimentary pinnacles spring from grotesque corbels at the string-course, with a plain corbel at the side of each to carry the water-spout. =The Central Tower. North and West Sides.=--The central tower of Ripon is probably unique among towers in being divided vertically between two different styles of architecture. Its north and west sides are Archbishop Roger's work,[38] but the other sides are Perpendicular, having been rebuilt after the collapse of the south-east angle. Seen from the north-west, however, it presents much the same appearance now as in the twelfth century, and either side displays a pair of round-headed windows, with the weathering of the original roof rising high between them and (on the west face) cutting off their corners. The windows have a shaft in the jamb, and the abacus of the capitals is continued round the tower as a string, but interrupted by the buttresses and weatherings, as is also another string below the sills. In the windows of the north side there is a space or tympanum over the inner arch. Each corner of the tower was strengthened by a pair of flat buttresses, with one shaft at the corner itself and another at the inner side of either buttress, and with the shafts banded half way up and again near the top. These buttresses are received in an overhanging corbel-table, above which runs a hollow moulding, filled with dog-tooth ornament of a large size and continued round the projections that serve for gargoyles. The use of this Early English ornament in a scheme which might otherwise be pure Norman affords a good instance of the Transitional character of the work. The battlements are later.