the chronometers developed by the Yorkshire carpenter and clock-maker John Harrison. Harrison built five chronometers over more than three decades. This work was supported and rewarded with thousands of pounds from the Board of Longitude,[24] but he fought to receive money up to the top reward of £20,000, finally receiving an additional payment in 1773 after the intervention of parliament
“...clock-maker John Harrison. Harrison built five chronometers over more than three decades...”
The movie Longitude depicts this story very well:
https://www.imdb.com/title/tt0192263/
It’s a bit hard to find...my copy came from the UK and I have a multi Oregon blu-ray/DVD player to view it.
SLIDE
Harrison was forced to wait for many, many years. It was most unfair.