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Groma
(227 words)

[German version]

(Greek γνώμων; gnṓmōn). Name of the Roman  surveyors' device for determining straight lines and right angles when surveying a terrain. It consists of a pole about the height of a man (ferramentum) and a rotatable cross of four horizontal rods (stella) attached to it at right angles. On the four ends were attached plumb-lines (perpendicula) almost down to the ground. The plumb attached to the centre point of the rotary cross (umbilicus soli) was aligned above the measurement point by a slight slanting of the ferramentum [3]. The application is known through Heron o…

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Schulzki, Heinz-Joachim (Mannheim), “Groma”, in: Brill’s New Pauly, Antiquity volumes edited by: Hubert Cancik and , Helmuth Schneider, English Edition by: Christine F. Salazar, Classical Tradition volumes edited by: Manfred Landfester, English Edition by: Francis G. Gentry. Consulted online on 23 September 2021 <http://dx.doi.org/10.1163/1574-9347_bnp_e428200>
First published online: 2006
First print edition: 9789004122598, 20110510



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