Signalling Method with Five Flags

• The Roman Five Flag Signalling Method used two rigs of trestles side by side.
• Each rig had a set of five poles with red flags at their ends.

Description

• The poles were hinged and combinations of one to five poles could be easily tilted up.
• A similar rig set up some distance away would receive and transmit in response.
• For night signalling torches were used.
• For numerals a sixth pole could be added.
• To read the signals the Polybius Square method was used.