| 21. | Clerestory windows provide energy savings and a more comfortable environment.
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| 22. | Some types have clerestories which let in light and air.
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| 23. | Above the gallery are the lancet windows of the clerestory.
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| 24. | The triangular clerestory windows are formed of gridded clear and coloured perspex.
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| 25. | This window feature is known as a " clerestory ".
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| 26. | The clerestory is 13th century and the tower is 15th.
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| 27. | It has a partial fourth-floor extension with a clerestory window.
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| 28. | In the 19th century, John Douglas when the clerestory was rebuilt.
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| 29. | The clerestory windows are copies of those at Exeter Cathedral.
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| 30. | Late in the 14th century a clerestory was added to the nave.
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