The McBride "New Age" Air Calliope is documented at the MMD website:

    http://mmd.foxtail.com/Calliope/newAge

I recently had the opportunity to hear and photograph another example of
this curious instrument.  I've placed some photos of the sixth and final
instrument that Melville McBride built on my website at:

    http://haskey.com/johnh/organ/mcbride_calliope

This instrument is for sale.  Please contact me, and I will put you in
touch with the current owner.

John Haskey