Talk:Ralph Jordan
There has been some degree of divergence in the spelling of the name of the Maccann Duet concertina. It seems to be generally recognised now that "Professor" Maccann spelled his name without benefit of the capital C which was introduced into it some time later, and that the spelling should correctly be "Maccann".
See the entry at http://www.concertina.com/merris/bibliography/duet-tutors.htm section D1 for further detail.