Marseille marigraph, Tide gauge observatory in 7th arrondissement, Marseille, France.
Description
The Marseille marigraph stands as a cylindrical tower equipped with mechanical and modern radar systems that continuously measure Mediterranean Sea level variations with exceptional precision.
History
Constructed in 1883 and officially establishing France's zero altitude reference point on January 1, 1897, this scientific instrument has maintained nearly uninterrupted sea level measurements for over 140 years.
Culture
This classified historical monument represents Marseille's deep maritime heritage and serves as the fundamental reference point for altitude measurements across France and its overseas territories.
Practical
Located on the Corniche near Villa Valmer, the facility houses both original mechanical equipment and modern digital sensors that provide essential data for climate change research and coastal management.
Did you know?
The marégraphe contains one of the world's rare integrating mechanisms with a bronze rivet covered in platinum-iridium alloy that serves as the absolute reference point for French territorial altitudes.
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