Source: wikibot/groma-surveying
= Groma (surveying)
{wiki=Groma_(surveying)}
The Groma is an ancient surveying instrument used primarily by the Romans and other cultures for land division and construction. It is designed to measure right angles and to lay out straight lines over distance. The Groma consists of a vertical staff (or pole) with a horizontal crossbar that is usually equipped with plumb lines hanging from each end.