Craig Brougher's post reminded me of another difference between the
chrysoglott and other organ-related metallophones: the bars are much
thicker, making the tone resonate for much longer.  I have seen them
with bars of steel and aluminum, with aluminum having the longer
'ring'.

I have seen two chrysoglotts with tremulants, both in Wurlitzer organs.
One used Vibraharp-like discs rotating inside each resonator.  The
other was enclosed in a box with a series of (I think) 12 narrow
shutters in front which rotated and produced the undulation.

Regards,
Bob Loesch, in beautiful Lake County, California, USA
http://home.jps.net/~rrloesch/index.htm