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Astragal

- properly used, it refers to a narrow, circular section moulding. More commonly, it is used to describe wooden glazing bars dividing up a glazed sash (Quite reasonably, these are also refered to as sash bars). Early astragals tended to be thick and chunky without much detail (Illustration). Gradually, as joinery techniques improved, they became more graceful and better detailed (Illustration). The profiles were first achieved by using sash planes, which usually came in pairs, numbered 1 and 2, where 1 achieved a rough profile, and 2 was used for finishing. In domestic property the detail is on the inside, the householder can appreciate it as he stands looking out of his window, while on shopfronts the detail is traditionally on the exterior, where it can be appreciated by a person looking in.
(Twelve pane divide Illustration) - see also Focus on Miln's Buildings