Scale: Unknown. A model depicting part of the process of manufacturing a scarph chock anchor, made entirely of iron. The model shows a roughly crescent-shaped lump of iron which is triangular in section and polished on two sides. Attached to one end of the crescent-shaped lump, and extending from it, is a long, tapering, four-sided bar, slightly irregular in shape. The bar terminates in a point. On one of the polished, crescent-shaped faces a number '3' is stamped and a '1' is stamped on the other face.