The glass in previous windows might be the really early 'plate' or 'wide' glass to 'crown' or 'cylinder'.[5] Outdated glass is recognised by its imperfections ('ream') which bring about optical distortion. In generations earlier, sash windows tended to get great glazing bars dividing up more compact panes, which contributed significantly https://judahkzmxh.theobloggers.com/42068353/detailed-notes-on-sash-windows