Built in 1903, the Finngrundet was a lightvessel that served in the Baltic Sea, undergoing various modifications such as the replacement of its paraffin light with an AGA beacon and a change from a fog bell to a 'nautophone' fog signal.
Electrification of its light occurred in 1940, followed by further modifications in 1957. The optics, built by G.W. Lyth of Stockholm, were mounted 11.5 metres above sea level and had a range of around 11 nautical miles.
In 1969, it was replaced by an unmanned caisson lighthouse. Now, it resides as a museum ship attached to the Vasa Museum, offering a captivating glimpse into its rich history.
Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons
Written by Nik Frost
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