Click
here for the chromatiphon
lay out 
coll.H.Geuns
"Praktikal" Bandonion by Schönherr & Matthes (Schöma) 1930's
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Uni sonoric "bandonions" 1
"Chromatiphon" by Hugo Stark(1873-1965) Berlin
Made about 1920
Left and right side 55 keys (Identical lay
out)
When turning the instrument upside down so that right becomes left, one can play
using the same finger positions when playing scales.
Click
here for the chromatiphon
lay out
coll.H.Geuns
"Praktikal" Bandonion by Schönherr
& Matthes (Schöma) 1930's
Both hands C-system lay out
Click
here for the praktikal bandonion lay out
coll. H.Geuns
This instrument was patented and introduced 1926.
Inside views above show a very refined mechanism of octave couplers (double
coupled)
The 3 voice instrument produces a 9 voice sound .
Right side 3-voice combination ( 16+8+8 ft) results in a 9 voice sound
Left side 2 voice combination (32 + 16 ft ) into 6 voices.
A special lever can shut down the lower octave - reeds.
"Praktikal" bandonion, unknown
maker 1920`s
right side
left side
coll.R.Schebera Cologne/Germany
detail of the keyboard right side
Special model Gebr. Wiessner, Munich 1930 's
Coupled keys on both hands.
Right hand lay out B-system Left hand lay out C-system
coll. H.Geuns
above right hand side above left hand side
Click here for the Wiessner lay out
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