Graphical Construction Glossary >> masonry. >> arch >> Surbase Arch
As the centre points of the arcs drop below the springing-line then the arch becomes flatter. Because it still has two separate arcs they still meet at a point, but as the arc centres approach the centreline of the opening the arch starts to look like a segmental arch.
The arch above is quite flat and although it is also at Leeds Castle in Kent it is from an early period than the one shown on the Gothic arch page.
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"When we build, let us think that we build for ever."John Ruskin 1819-1900
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