Believe it or not, glass is a liquid, and it moves VERY slowly. Over decades, perhaps more, the glass in windows will succumb to gravity and drip down to the bottom of the windows, pooling up there and making the lower parts of windows slightly thicker as time passes. The older the building is, the more irregularity you will find between the bottoms and tops of its windows. As far as architecture goes, you do not need to worry about the durability of the windows or anything of the sort because of this.
Old glass windows are thicker at the bottom because of the way they were made. During the manufacturing process, the glass was often unevenly distributed, causing it to flow and become thicker at the bottom over time.
Old glass windows are thicker at the bottom because of the way they were made. During manufacturing, the glass panes were often placed vertically, causing the glass to flow down slightly due to gravity. Over time, this slight deformation led to the thicker bottom edge that we see in old glass windows.
The old WTC buildings
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It is a myth that very old homes have windowpanes with thicker glass at the bottom. This misconception likely arose due to the way glass was made in the past, which resulted in uneven thickness rather than intentional design. Old glass windows may appear thicker at the bottom due to the effects of gravity over time.
No this is an old joke
Glass is an amorphous solids and therefore are pseudo solids.Hence like liquids it has tendency to flow.therefore in old buildings the glass paneslook milky in appearence.by Jaspreet Singhanswered on 1-04-2013
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Old glass appears thicker at the bottom due to the manufacturing process used in the past. During that time, glass was often made by blowing it into a mold, causing the glass to be unevenly distributed and thicker at the bottom.