Venetian windows with wide timber mullions (triple box sash) or masonry framing are addressed as 3 personal windows. When the heavy taxation of glass was repealed, in the course of the century, cylinder glass quickly displaced crown glass creation. Dividing up smaller units of double glazing with thick glazing bars https://cristiansycfj.bligblogging.com/36202026/not-known-facts-about-sash-window-draught-proofing