Google Excelsior and Paul Brodie. Try this YouTube link.

http://video.google.ca/videosearch?q=board+tracker+replica+BC&hl=en&emb=0 &aq=f#q=youtube%20board%20tracker&hl=en&emb=0

Or his web page.

http://www.flashbackfab.com/pages/excel00.html

Pete

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Pete Snell
Department of Physics
Royal Military College
Kingston, Ontario,
Canada
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Imagination is more important than knowledge.

Albert Einstein (1879-1955)