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Kronstadt futshtok

The futshtok service (sea level measurement) in Kronstadt was founded in 1707 and is one of the oldest in the world (the third). The futshtok is a gauge with marks of average water level in the Gulf of Finland. This one was set in 1840 by hydrographer M. Reynike. Mean sea level was set based on the results of observations in 1824-1839 period.

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