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| | Roman Glory: Hadrians Wall |
 | | The military surveyors, known as mensors, carried a Groma with them for laying out right angles, a decempeda (a 10-foot rod) for measuring short distances, a waxed cord or rope for measuring longer distances, a plumb line level known as a libra, and writing and drawing materials. |
 | | The mensors were responsible for the overall position of the Wall, the stationing along its length of turrets, mile-castles, and forts, and the interior layout of each fort. |
 | | Turrets are sometimes referred to as signaling stations, but it is not known what devices or codes the Roman sentries might have been using. |
| www.surveyhistory.org /roman_glory_hadrian's_wall1.htm (1192 words) |
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