Newlyn Lighthouse Jubilee Pool and the War Memorial Penzance
by Terri Waters
Title
Newlyn Lighthouse Jubilee Pool and the War Memorial Penzance
Artist
Terri Waters
Medium
Photograph
Description
Newlyn Lighthouse with Jubilee Pool and the War Memorial Penzance in the misty background.
The unassuming little white shed in front of the lighthouse is Newlyn Tidal Observatory, the home of mean sea level for mainland Great Britain.
Sea level was measured using averages of readings taken using a device known as a tide gauge. On 30 April 1921, sea level recording here by OS was concluded after six years of measurement. Within these six years, the Newlyn tide gauge took hourly readings.
Conducting and recording these measurements over a set period of time enabled a mean sea level “datum point” to be established, and every height measurement in the country has been determined based on the work of this machine. The resulting height datum is known as Ordnance Datum Newlyn (ODN) and marks height zero on maps in Britain.
Uploaded
January 1st, 2022
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