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Hi colleagues,
Thanks to all who responded to my request for historical
locations and longitudes for the C18 Adams dial. As ever, the List is fast
and comprehensive. Special thanks to Bill Thayer, Andrew James, Brad
Lufkin, Fred Sawyer, G Faltlhans, Frank Evans and Peter Mayer - apologies if
I've missed any responses.
I've just about filled in all the gaps on my list now and
am busy comparing the results, both with real life and with other period dials
that use the same list. I suspect that the dial makers had a published
list that they referred to for years, without checking the latest navigational
information. Some of the longitudes are over 10 degrees off, on a dial
which generally shows high precision and accuracy, and I can't believe that
sailors could have found their way with that degree of uncertainty!
Regards,
John
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