unisons by ear or machine

[Richard Moody]

"hold the phone" as they used to say in Virginia. Let me get this
straight.  You tune the individual strings in a unison with the RCT and it
reads all three strings together as 0.5 cents flat??  That should make an
audible difference in a Fifth at middle C.  And what does that unison
sound like to the ear? What happens if you  tune each string in the unison
by ear and then scope it with the RCT? 
	This interesting because I have always suspected that the unison when
declared "in tune" by two or more technicians might not measure out the
way theory predicts. I could test Tunelab on this....  ---ric  (has
suspected wrong before)

ps.  What happens if you measure from the other side? 

----------
> From: Roger Jolly <baldyam@sk.sympatico.ca>
> To: pianotech@ptg.org
> Subject: Re: Counter bearing treatment
> Date: Wednesday, January 12, 2000 10:05 PM
> 
> Hi Ron,
>            I've done quite a few measurements on the string coupling
effect. 
> When an average 3 string unison is tuned for full blush (RCT) on each
> individual string,
> 2 strings played together will show about 0.3 cent flat, 3 strings will
> show 0.5 cent flat.
> I'm not so sure what the imformation is telling me.
> Regards Roger
> 
> 
>