The key stone is the stone placed at the apex of the arch, and prevents the two sides of the arch falling in and collapsing.
the key stone is the stone that is at the top of an arch. It is this stone that absorbs the majority of the forces stabilizing the arch formed
Newport Stone Arch Bridge was created in 1853.
Lalino Stone Arch Bridge was created in 1870.
Pithole Stone Arch Bridge was created in 1899.
Tusten Stone Arch Bridge was created in 1896.
Stone Arch Bridge - Minneapolis - was created in 1883.
Hankins Stone Arch Bridge was created in 1905.
Stone and clay was used and packed to form the arch of Augustus. Their were two.
Key-stone.
Woodward Road Stone Arch Bridge was created in 1887.
Ruhle Road Stone Arch Bridge was created in 1873.