ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Ancient Indian clock (ghati). The coconut shell takes a measured time to sink. In ancient times this was exactly 24 minutes. When it sank the priest would strike a gong and pull it up to the surface again. This indicated that one 'hour' had gone by and there were 60 hours in a day.
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