The Groma allowed Accurate Surveying of Straight Lines and Right Angles https://www.muelaner.com/measurement/make-a-simple-groma/

The Groma allowed Accurate Surveying of Straight Lines and Right Angles ...

This illustration shows a groma, a surveying instrument used by the Romans to plot straight roads between towns. This simple tool enabled Roman engineers to connect towns even when they were out of sight of each other, for example, with hills in between. https://www.mylearning.org/resources/illustration-of-a-roman-groma

This illustration shows a groma, a surveying instrument used by the Roma...

Graphics showing groma being used. https://imperiumromanum.pl/en/curiosities/reconstruction-of-roman-measuring-tool-groma/

Graphics showing groma being used. https://imperiumromanum.pl/en/curiosi...

Groma

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