Sentence:  But as the rope muſt lead the pulley, or the pulley the rope, when there is room to apprehend that the rope may not ſlide upon the pulley, the <WSD>gorge</WSD> is hollowed in the form of an angle, or ſtuck with points, [...]. 
Meaning of the word marked with <WSD> tags:  The groove of a pulley.