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Description: | A Roman copper alloy probable plumb bob, apparently complete although a little damaged. It measures 37.65mm in length, 19.28mm in max.width and thickness. Weighs 12.40g.The object consists of a vertical shaft with bead-and-reel (double beads) decoration rising from a spherical terminal c.5.5mm in diameter pierced both vertically (in one face) and horizontally (in two opposing faces), c.1.5mm diameter. The shaft measures c.5mm in diameter and thickens to c.6mm below a hollow conical 'skirt', c.1mm thick and 19.28mm in diameter. Two sections of the edge have been squashed. There is iron staining around the top of the shaft, where it disappears into the solid body of the cone.The cone narrows to 5.91mm in diameter where a hemi-spherical knop 11.40mm in diameter and 7.5mm high extends, At the centre of this is mushroom-shaped projection, the stalk 1.82mm in diameter in cross-section, the head 3.09mm in diameter.Cf. Appels & Laycock 2007 p.142 Fig.AA15.28, of which the authors write '[this plumb bob] is probably Roman and could well have been part of a groma, which was the main Roman surveying instrument. The instrument itself was of a very simple design, having crossed arms which rested on a bracket attached to a vertical pole. The four arms each had a cord with a hanging plumb bob attached'. Also cf. CAM-8F3037
Original Image | Publisher: | http://finds.org.uk | Source: | Portable Antiquities | Identifier: | http://finds.org.uk/database/artefacts/r... | Go to resource |
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