[CAUT] Duplex angle

[Alan McCoy]

Hello,

Point of clarification regarding "counterbearing angle."  I want to check
out an assumption of mine about this. When there has been discussion about
this on either list, some angle, for example 10-15 degree, is said to be in
the ballpark of what we are looking for. The question is which angle are we
referring to? The angle formed by the capo at the vertex, or the angle
formed by the counterbearing bar as the vertex?

These would be equal only if the speaking length and the length from tuning
pin to counterbearing are exactly parallel.

Of these it seems that the angle formed by the capo would control in part
the effectiveness of the string termination, i.e. preventing loss of string
energy into the duplex. Whereas, the angle formed by the counterbearing bar
would have more to do with tunability & tuning stability and also the tuning
or detuning of the duplex segment.

In a fully-strung instrument, how would I measure these different angles?

Thanks for you thoughts.

Alan

-- Alan McCoy, RPT
Eastern Washington University
amccoy at mail.ewu.edu
509-359-4627