article about just intonation harmoniums

Maybe my article about just intonation harmoniums is of use for you
(unfortunately it is in German):

Karl Traugott Goldbach, „Arthur von Oettingen und sein
Orthotonophonium im Kontext", in: Tartu ülikooli muusikadirektor 200,
ed. Geiu Rohtla, Tartu 2007, <http://hdl.handle.net/10062/5574>.

Best wishes

Karl