By flame, drum and song
How did people communicate over distance in the ancient world? We answer this question by examining signal fires, talking drums, and languages composed entirely of whistling.
Here’s an article about whistle languages.
Here are a couple of videos about whistle languages.
Here’s an article about the history of long distance communication.
Here’s a bit about the hydraulic telegraph.
Here’s an article about ancient communication and the use of drums.
And here’s a video demonstrating some African drums.