Kenny's ultimate size but it's only ultimate is stop motion here please.

The Ordnance Survey established the observatory in 1915 to contribute to the measurement of a national vertical datum defined by mean sea level. The subsequent 6-year measurement campaign at the observatory, conducted from 1 May 1915 to 30 April 1921, determined the value of mean sea level as 4.751 m below the level of the brass bolt benchmark inside the hut. Due to the stable underlying granite bedrock, the proximity to the open ocean, and the absence of rivers, the observations at Newlyn were selected as the basis, or ordnance datum, for elevation measurements across Great Britain. To realise the reference datum across the country, in the early twentieth century spirit levelling techniques were used to measure a national network of circa 200 fundamental benchmarks, all referenced to the Newlyn brass bolt.[2][3][6][7]

From 1915 to 1983 the observatory measured sea level using a float in the stilling well, along with a gauge supplied by Cary and Porter. With advances in technology, an Aanderaa pressure gauge was installed in 1981 to operate alongside the well gauge. From 1983 onwards, the primary sensor has been a bubbler pressure gauge.[3][8]

The Ordnance Survey operated the tide gauge until 1983, when the Natural Environment Research Council took over the management.[3] The observatory was denoted as grade II listed status by Historic England in December 2018.[9] As of 2023 the observatory is operated by the National Oceanography Centre, and funding support is contributed by the UK Environment Agency.[1][3]
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