> Actually, Russell, there are no electronics involved.

I realise that. That's why I specifically mentioned the EE tag. It ISN'T
electronic but it has the look and feel. I wanted people to know I knew but
not tell them too much in advance so they could share the same discovery
process. ;-) My first thought was that it WAS electronic but it rapidly
became evident that it wasn't. Them saying that it wasn't was the real
give-away :-)



        RM

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