Before revision: Edward Cresy An Encyclopaedia of Civil Engineering - 1847 "The gib of a crane should always revolve wholly round its axis, and be able to deliver the load at any point of the circle described by the axis of the gib" Usually gib-arms are attached to a vertical mast or tower or sometimes to an inclined boom.
After revision: Edward Cresy An Encyclopaedia of Civil Engineering - 1847 "The gib of a crane should always revolve wholly round its axis, and be able to deliver the load at any point of the circle described by the axis of the gib" Usually jib arms are attached to a vertical mast or tower or sometimes to an inclined boom.