Ancient Persian clock in Qanats of Gonabad Zibad. Water was placed in the smaller copper bowl that has a small hole in the bottom, allowing water to drain into the larger bowl. On the inside of the smaller bowl at about 2 o

Ancient Persian clock in Qanats of Gonabad Zibad. Water was placed in the smaller copper bowl that has a small hole in the bottom, allowing water to drain into the larger bowl. On the inside of the smaller bowl at about 2 o'clock there are series of graduated dots showing the time based upon the level that water declined inside the bowl.

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