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 Category: Charting/Tides/General/ • High Resolution Photo Available
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