Diagram showing relationship of tide to marker at Poolbeg Lighthouse.
Datum referred to low water April 8, 1837 for County Dublin.
Note use of Mean Sea Level
Image ID: theb2365, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Poolbeg Lighthouse, Ireland
Photo Date: 1837
Credit: NOAA Central Library
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of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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April 30, 2013