ETD question re: unisons

[J Patrick Draine]

Presumably you've read the article by Jim Coleman Sr. in which he 
confirmed the phenomenon. I think he noticed it primarily in octave 
5, and to some degree in octave 6.
I can measure it with my SAT II, sometimes as much as 1 cent. But 
it's hard to be absolutely sure when most of my clients' pianos are 
undergoing 20 - 60 cent pitch raises.
More research is certainly warranted. May I suggest to the university 
technicians out there, that collecting such data, and writing an 
article for the PTJournal, may not only benefit the rest of us, but 
also may be useful in negotiating with your administration ("publish 
or perish", research, etc.).
This research might best be conducted in a situation where there's a 
stable of quality instruments (S&S Ds,& Bs for example, compared with 
similar size Baldwins and Yamahas for example) already maintained at 
concert ready condition (stable pitch,  excellent regulation & 
voicing). Determining the note range in which the unisons go flat, 
and by how much would be very valuable information. Collecting data 
in conditions of varying humidity would also be helpful.

So there's a quick draft for a research project -- anybody have 
further thoughts?

Patrick

>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