Limnigraph in Výtoň, Technical monument in Výtoň, Czech Republic.
The limnigraph in Výtoň is a copper-domed structure featuring a dog-head-shaped weather vane with water level indicators on all four walls. The device connects to the Vltava River through a tank system that continuously records water heights.
This structure was built before World War I as a meteorological station measuring atmospheric pressure, temperature, and water levels. From its inception, it focused on scientific monitoring of the river.
The name Výtoň comes from a 14th-century tax system where raftsmen paid duties on timber floating down the Vltava River. The area served as a significant hub for wood trade along the waterway.
You can observe the device from outside, viewing water level readings through markers on all four sides. The location sits directly on the riverbank, making visits during normal water conditions most informative.
The four clock faces on each side display both time and water measurements simultaneously. This design makes many passersby mistake it for an ordinary street clock and overlook its actual purpose as a scientific instrument.
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