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The ancient art of telling time with fire and smoke
Thursday September 15, 2022. 03:09 PM , from BoingBoing
In China, the use of incense smoke to tell time dates back to the 6th century CE. Incense would be lit at the bottom of a maze and burn its way through, with outlets to vent the smoke and indicate the time. — Read the rest
https://boingboing.net/2022/09/15/the-ancient-art-of-telling-time-with-fire-and-smoke.html
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