Graphical Construction Glossary >> masonry. >> arch >> Rear Arch
These relieving arches are of course used to share the load of the masonry above the opening, but at the same time they add amenity to the room that they serve. The extra height and width of the (in this case) outer openings gives a lot more light and a wider field of view than if the window opening went through the full width of the wall.
In addition they also gave the architects more possibilities for establishment.
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