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Roman Roads
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Drawing of a roman groma. Showing a long vertical stick, with a cross shape of smaller sticks mounted on the top. A string is tied to the end of each arm of the cross and a small weight is on the end of each line. Add to board
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Illustration of a Roman Groma

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.

Image © Public Domain | Wikipedia