Sorry Tug of Cox, "Impatience" is my middle name (well, not really, but maybe it should have been.

Here are the hyperlinks to the online resources that you shared in your post:

Link to the Joseph Antonio Emidy home page:
http://www.emidy.com/

British Association for Local History: Event in 2007 honored Emidy and commemorated the bicentennial of the end of British involvement in the Atlantic slave trade.

http://www.balh.co.uk/lhn/article.php?file=lhn-vol1iss83-6.xml

Details of Emidy's life are found in the autobiography of politician James Silk Buckingham (London, 1855). Buckingham played flute and studied music with Emidy. Find this at JSTOR: *

http://links.jstor.org/sici?sici=0027-4666(198611)127%3A1726%3C619%3AJEAAIC%3E2.0.CO%3B2-G

Here are some maps of Cornwall, England:

http://www.cornwall-calling.co.uk/mapof.htm

-snip-


* Unfortunately, I'm not able to access full JSTOR articles.   However, Google took me to this website which may or may not be similar:

http://www.jazzbows.com/blackviolinlinks.html