rough arch

rough arch

Same as discharging arch; built with rectangular bricks and wedge-shaped mortar joints.
Mentioned in ?
References in classic literature ?
Upward and outward the stone walls swept, and they saw dimly before them, in the light of their torches, a vast cavern, seemingly formed by the falling in of mountains, which, in toppling over, had met overhead in a sort of rough arch, thus protecting, in a great measure, that which lay beneath them.