Plumb bob Made of oak and bronze. Triangular in shape, the apex is adorned with a fleur-de-lis, a motif repeated in openwork at the centre of the triangle in a more stylised form. A wire holds the plumb bob, which is shaped like an ornately carved acorn. Moulded edges and plinth. 19th century H. 34.3 cm – L. 45 cm May have belonged to a Freemason