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Figure 27.
Purbeck slates waiting to be reused at Langton Matravers. In some of the slates the peg hole is several inches from the top edge. This is because they were used in a course of shorter slates rather than because a higher hole would be too weak. Lowering the peg hole keeps the tail of the slates in a straight line. On courses of long slates there is plenty of room for the extra length above the hole to sit between the battens. (Terry Hughes). |