[ARC5] R-25 dial nonlinearities

[gordon white]

   Back in the day I spoke to the receiver designer, Paul Farnham, if 
have the name right,  about designing the variable capacitor plate shape 
and he gave me some formulae and diagrams, which I may have somewhere, 
though not in reach at the moment.


     Unfortunately I did not hear that he had died until his heirs 
tossed out his design notebooks.


  - Gordon White

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