ETD question re: unisons

[jolly roger]

Hi Howard,
                 Yes it is easy to confirm.  The test that I have done with
a RCT show about a 0.3 cent drop in octave 5/6. The test was performed by
tuning each string individually several times, to over come the
interaction. then the net 3 string unison was measured.
The effect is known as string coupling.
My own theory is that. as all strings start to increase the amount of
energy into the bridge, the board is moving through a greater excussion,
and hence dropping the frequency a tad.
Now I've been out to lunch before, and I could be off base on this one.
Regards Roger 


At 10:47 AM 2/14/01 -0500, you wrote:
>Hi everyone,
>
>Since I know nothing about ETD's my question might be naive. Nevertheless
>here goes: I believe that Virgil's assertion that a 3 string unison is
>flatter than each of the single strings heard singly, is a bit questionable
>or should I say not fully accepted. Wouldn't it be easy and conclusive to
>check this thesis by using an ETD to measure this? Thanks!
>
>
>Howard S. Rosen, RPT
>7262 Angel Falls Ct.
>Boynton Beach, Fl  33437
>
>hsrosen@gate.net
>