MOTM

Just wondering about the Tannerin and the
ribbon control device - What exactly is
the construction ? I have seen things as
simple as a pecil streak on a strip of 
whatever with a probe all the way up to
a fancier Moog type where the conductor and
connection are all inside the ribbon  unit.
I think there may even be a special oil
type that when You press on it the oil seperates
(viscosity break point) and makes a floating
connection along a couple of conductive strips of
metal. The moog one since it went into mass
production is I suppose a good one but I need to
know what it was made out of. Any ideas ?
Thank You ahead of time- Bill.
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