Storied windows : a traveller's introduction to the study of old church glass, from the twelfth century to the Renaissance, especially in France (1914)
Bushnell, Arthur J de Havilland · New York : Macmillan · leaf 36
lydiminished till it became a mere mullion or thinshaft of stone separating two lights of the samewindow. Then an arch was employed to enclosetwo or more lights. The tympanum, or blank spaceof stone between the enclosing arch and the topof the enclosed lights, was pierced with one ormore circles.… … Early Gothic Lancets skparatkd by Wai.i. Space.
Glass painting and staining · Cathedrals
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