Scale: Unknown. A model depicting part of the process of manufacturing a scarph chock anchor, made entirely of iron. The model shows an irregular rectangular wedged-shaped lump of iron, with three smooth flattened faces, and one curved face. Attached to one end of the wedge, and extending from it, is a long, tapering, four-sided bar, with an angled shoulder, which is slightly irregular in shape and terminates in a point. On the smooth curved face is stamped '4' (twice) and the number '1' is stamped on the tapered square section.