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SECOND PERIOD 172 DUNDONALD CASTLE and about 25 feet high (Fig. 139). It was vaulted with a pointed tunnel vault, with two bays of about 25 feet each, having transverse and diagonal FIG. 138. Dundonalcl Castle. Lower Vault, looking South. moulded ribs of large section, measuring 14^ inches across by 10| inches in depth, with very depressed wall ribs between, formed of an arc of a circle. These ribs spring from corbels (Fig. 139A), and are merely
