Glass Flow in Old Windows
 Windows in older buildings are often thicker at the bottom than at the top. Previously, it was taught that glass was a liquid that dripped down over the years, causing the bottom edge of the glass to thicken. Current knowledge suggests that glass drops do not occur during the observation period when the glass is in the windows. Previously, flat glass was uneven in thickness, so the thick edge of the cut window pane was placed at the bottom to create a balanced effect.
In old buildings, it was natural to place the thicker part of the glass at the bottom of the pane. Glass was a valuable material, so ordinary people's windows had the most uneven glass surface. Therefore, the thicker part of the glass could also be placed in the middle of the window. After examining old churches in the summer of 2007, I found thicker parts of the windows elsewhere than at the bottom of the glass. Two thousand years later, it was not certain whether the glass in the windows leaked or not. When the Romans began using glass in windows in the 4th century.
5.1.2015*14:57 (969 - 281)
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