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Bookmark or Share- Groma | surveying instrument | Britannicacartography. trilateration. triangulation, in navigation, surveying, and civil engineering, a technique for precise determination of a ship’s or aircraft’s position, and the direction of roads, tunnels, or other structures under construction.
- THE GROMA, A COMMON SENSE APPROACH AN EXAMINATION BY THEORETICAL ...SYNOPSIS. The Groma is a device used by Roman surveyors, the Agrimensores, to align surveys and set out right angles. There are two schools of thought regarding the fundamental design of the Groma. This paper deals with that controversy, using a practical approach, based upon surveying in the field. BACKGROUND.
- Roman SurveyingThe GROMA consisted of a vertical iron staff (ferramentum) about 5 feet long, pointed at the lower end, and with a cross arm, 10 inches long, pivoted at the top, which supported the main aligning element - the revolving "stelleta" (star) with arms about 3-1/2 feet across: The two main roads at right angles in a Roman encampment were located by ...
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- Ancient History in depth: Discovering Roman Technology - BBCThe groma was the standard Roman surveyor's instrument. It's an upright stick with a couple of bits of wood fixed to the top to make a cross. From each end of the cross hangs a little weight on a...
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