[icot]

The original document by G. Bergenroth mentioned in the link provided by jeioncs is supposed to have a description of the original procedure. I don't know how/if you can get a document from the National Archives of the United Kingdom, though.

Edit: Link to the actual Archives entry: http://discovery.nationalarchives.gov.uk/details/r/C12056

[hordeallergy]

I live a five minute walk from the archives, they're open to all, but closed today.