The mareograph (mareograph; literally "sea recorder") is a self-registering instrument for the continuous measurement of the sea level at an oceanographic gauge station .
It belongs to the group of writing levels and was developed in the 19th century to automate the periodic reading on the traditional level staff .
With long-term registration, the mean water can be specified to the centimeter and serve as a reference level for the national survey . The level of this mean sea level corresponds approximately to the geoid .
- Gerd Morgenschweis: Hydrometry: Theory and practice of flow measurement in open channels . Springer-Verlag, 2010, ISBN 978-3-642-05390-0 .
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