The glass in aged windows could be the really early 'plate' or 'wide' glass to 'crown' or 'cylinder'.[five] Aged glass is recognised by its imperfections ('ream') which lead to optical distortion. B – sash cord. Each individual sash is connected to a sash twine that may be attached on the aspect from https://zanderkfxpf.digitollblog.com/35594354/getting-my-sash-windows-to-work