Bond stone
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| The bond stones seen on the end of the right wall of the Footpath at Nab End, Longwood extend across the width of this tall, battered, dry-stone wall and serve to strengthen it. |
A bond stone (also known as a bonding stone, boutisse, through stone, tie stone, parpen, parpent or parpend) is a large stone which passes through a wall from one side to the other. The purpose of the bond stone is to lock the layers of the wall together and reinforce the structure.
See also Perpend
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