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Tazmo61

John Harrison Marine Chronometer H4

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Thanks Bernie, you can't read enough about the great man! :thumbsup:

Found the first paragraph amusing stating that Astronomer Royal Nevil Maskelyne had edited the book :whistle:, he was certainly John Harrison's nemisis!

Considering that Maskelyne's predecessor Edmund Halley, who with renowned clockmaker George Graham, recognised Harrison's immense talent & assisted his introduction to the Board of Longitude.

Thankfully George lll intervened & put a stop to ^^^^^ carp & John Harrison was, rightfully so, awarded his prize. :notworthy:

 

If I may (again) Bernie, add another fascinating reference which some may find interesting ?...

https://www.theatlantic.com/technology/archive/2016/01/pendulum-clock-john-harrison/424614/

:thumbsup:

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Thank you , Alan .

I found your additional article very interesting indeed . The section on the grid-iron pendulum was fascinating . The use of two different metals with differing expansion rates , keeping the pendulum the same length at different temperatures was genius . Well worth a read IMO . Thank you for posting the article , Alan 

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Here’s paperwork I have from when it was loaned to the US in 1963.6eee9dd7c8b08e0120bcb2355aae50cb.jpg002b9130fc5af367e56b793de96e5248.jpg

Foggy


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