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tongued mitres  
  • In a tongued mitre, the two turn-ins that meet at a corner are trimmed to leave a space between them which is filled by a strip, or tongue, of the covering skin which is pulled over the corner to lie between them. The covering skin was usually trimmed on the board, and this often leaves clearly visible knife-cuts in the board which allows the existence of tongued mitres to be identified even when the tongues, and possibly the turn-ins, have been lost. The tongued mitre was developed to allow relatively thick covering skins to be drawn neatly over the corners of thick wooden boards. Tongued mitres were a common feature of medieval bindings, and are found on Armenian and Byzantine as well as western European bindings. Their western-European use continued until the mid-sixteenth century, when they are found on books with both paper and wooden boards.
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