they were made that way. ours today are very even because we use a different process (layer of molten glass on a layer of molten tin, makes a perfectly smooth sheet of glass) They did not have our technology back then. So their sheets had uneven thickness. Also, some windows are thicker on top, not t the bottom, because they happened to be mounted that way and they did not change shape.
they were made that way. ours today are very even because we use a different process (layer of molten glass on a layer of molten tin, makes a perfectly smooth sheet of glass) They did not have our technology back then. So their sheets had uneven thickness. Also, some windows are thicker on top, not t the bottom, because they happened to be mounted that way and they did not change shape.