The glass in old windows may be the very early 'plate' or 'wide' glass to 'crown' or 'cylinder'.[5] Old glass is recognised by its imperfections ('ream') which bring about optical distortion. Window Sash Substitution Kits If your window sash breaks, it is achievable to buy a sash substitution kit. This https://familyphotography35578.blogs100.com/36351625/the-smart-trick-of-sash-window-draught-proofing-that-no-one-is-discussing