Simplex hinges

Sash windows may be fitted with simplex hinges, which allow the window to be locked into hinges on one side while the counterbalance on the other side is detached, allowing the window to be opened for escape or cleaning.

Glazing

The glass in old windows can be the very early 'plate' or 'broad' glass to 'crown' or 'cylinder'. Old glass is recognised by its imperfections ('ream') which result in optical distortion. Traditional cylinder glass is still made, but other sorts of antique glass are no longer

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