Stones {arch, building}| can curve over space between two stone columns. To build, stones rise from column tops. Scaffolding holds stones. Top middle has a stone {keystone}, added last. Arches have side and downward pressures. Steel arches use steel rectangles. Beams or bridges can be on arch tops.
Straight beams {lintel} can lie across two column tops {post} {post and lintel}|.
Visible frames {truss, roof}| can support roofs over halls.
Semicircular arches can have wedge-shaped blocks {voussoir}, not overlapping stones.
First arches {corbel} had center point.
Gothic cathedrals had pointed arches {Gothic arch}.
Romanesque churches had round arches {Romanesque arch}.
2-Art-Architecture-Building Parts
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Date Modified: 2022.0225