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Banner Artemide eLive Auktion 18
Lot # 1056
"Groma" weight in the shape of amphora.
Roman period, 1st-3rd century AD.
35x18 mm. 36.48 g.
In the building of a Castra, after having flattened the ground and before starting the ditch and wall construction, an agrimensor (land surveyor) drew the locations of the streets and of the wall, beginning from the center of the field, using the groma. It follows the description of this topographical tool and its use.
(https://legioneromana.altervista.org/content/how-use-roman-groma?language=en).