strengthening by an elaborate system of iron bars, and the effect of the great bare circle is far from satisfactory. At Chartres (early thirteenth century) where they possessed a hard stone easily split into thin slabs, this circle becomes a thing of beauty by being partly filled up by slabs pierced with quatrefoils and forming round the centre a circle of great cusps holding the iron ring which carries the glass. In this case the wall arch is made semicircular, to enable the rose to be exactly fitted under it. Beneath the rose are two pointed lights placed side by side. Other places, like Reims and Amiens, which had not the advantage of the Chartres stone, had to build up their windows with small materials, but adopted thence the system of cusping round the circle, which henceforth became one of the chief characteristics of Gothic window-tracery, and did away with the need for the elaborate iron bars of Notre Dame. At Reims, where they first appear after Chartres, the cusps are inserted into a groove in the great circle, and have blunt ends into which the iron ring which sup- ports the glass is screwed. At Amiens, the circle cuspings are still separate and fixed in a groove, but they are trefoiled, so as to diminish the ring, and the lower lights have cusps taken, like the English ones, from the solid. Even these had a useful origin in strengthening the little arch of the win- dow-light. This is very thin and liable to break, especi- ally in French work of the late thirteenth century, such as St. Nazaire of Carcassonne; but the cusp underneath it converted this slender bar into a strong triangle, even when the cusp was itself pierced.
WINDOW, CHARTRES
But even thus, the glazing spaces of windows of this size were felt to be still too large. Far more was this the case when spaces so enormous had to be filled as those under the high vaults in the clerestory of Amiens. Their truthful
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Publication Information: Book Title: Gothic Architecture in England & France. Contributors: George Herbert West - author. Publisher: G. Bell & Sons. Place of Publication: London. Publication Year: 1911. Page Number: 128.
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