In architecture, a keystone is a crucial element of a stone arch through which it gains stability. It is generally the last one to be placed thereby locking the stones into position.
Image – Thisiscarpentry.com
FACT FOOD #1916
In architecture, a keystone is a crucial element of a stone arch through which it gains stability. It is generally the last one to be placed thereby locking the stones into position.
Image – Thisiscarpentry.com