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
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
| NOAA Disclaimer
November 10, 2017