This is John Harrison's 1759 chronometer, a clock which calculated longitude while at sea. It took him over 30 years of trial and error to perfect the technology. The watch itself is 13cm in diameter and you can see it for yourself at the Royal Observatory Greenwich.
for Sunday Stamps - your choice
3 comments:
A very intricate design, both for the device and the stamp!
My stamps are also British.
Gorgeous stamp and a wonderful piece of science and craftsmanship.
My stamps also feature practical objects here
My contribution is here:
http://viridianpostcard.blogspot.com/2020/11/sunday-stamps-free-choice.html
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