The Gateway Arch—which takes the shape of a catenary curve, or the curve formed by a chain held at two fixed points—was built using the “keystone-in-place” method of construction.
A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community.
The trough of the aquaduct could rest on the center and top of the arch, the keystone (red in the models). From there, the downward vertical force is modified partly into outward horizontal force, and ...
Keystone Linings is a leading manufacturer and supplier of perforated, slotted and patterned acoustics and decorative walls and ceilings linings. For over 40 years, Keystone Linings have specialised ...