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Image: Royal Observatory, Greenwich 2010 PD 14

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Description: Harrison's third timekeeper H3: This timekeeper took 19 years to build. In 1759 it was not quite accurate enough to win the 20,000 pound prize.
Title: Royal Observatory, Greenwich 2010 PD 14
Credit: Own work
Author: Bin im Garten
Permission: Own work
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes

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