erickson's metal rods

Would anyone have any information on the stroked metal rods used by Rober=
t
Erickson in several works?

Also, I am curious about his use of tunings. I recall his article in SOUR=
CE
which described several instruments built for his piece CARDENITAS, and
that his tuning had ''good thirds and bad fifths'', but would like to kno=
w
more. Also, what has become of the instruments?


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