The keystone is the most important component of an arch. However, it is also the component that endures no stress — and, typically, responsibility and stress go hand in hand. A keystone is the ...

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 ...

It provides you with the ability to build what you need cheaply and effectively. The Arch Company invested £100,000 in the development of Keystone, which Wood describes as low risk. This enabled ...