Fris Rutter

An instrument made of iron, and used for the purpose of blocking up an haven, or a river. The following description of it is among General Monk’s observations on political and military affairs. The beams through which the upright bars pa must be twelve feet in length, and the upright bars that go through the beam must be of that length, so that when one of these iron fris rutters is let down into an haven or river, the perpendicular bars of this iron instrument shall be deep enough to reach at high water within five feet of the surface. See Chevaux-de-Frize .