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<DIV><FONT face=Arial size=2>Keith-</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The demonstration you cite may have been an example
of both string coupling and para-inharmonicity.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>At this time the most useful discussion of unison
behavior in piano strings is probably Jim Ellis's series in September, October
and November 1982 Piano Technicians Journal. I recommend it
highly.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed Sutton</FONT></DIV>
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<DIV>So Virgil played the checks that aurally, everyone in the room could hear
the difference. Then Dr Sanderson tried to measure it and there was no
difference. He changed the note he was reading, moving up the partial chain
and low and behold the note was flatter at the the 4th partial. At least I
think it was the 4th, may be the 3rd. Certainly some ETDs will not focus on
the proper partial so the operater has to override. </DIV>
<DIV> </DIV>
<DIV>The change in the partial structure will certainly make a tuner alter his
tuning and I think that is the point Virgil was trying to make.</DIV>
<DIV> </DIV>
<DIV>Keith Roberts<BR><BR> </DIV>
<DIV><SPAN class=gmail_quote>On 6/13/07, <B class=gmail_sendername>Richard
Moody</B> <<A
href="mailto:remoody@midstatesd.net">remoody@midstatesd.net</A>>
wrote:</SPAN>
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<P><FONT face=Arial color=navy size=4><SPAN
style="FONT-SIZE: 14pt; COLOR: navy; FONT-FAMILY: Arial">I am thinking about
a research project hopefully resulting in an article, to get interaction
from piano technicians about such concepts as, "coupled motion"
"para inharmonicity", "longitudinal vibration" (did you really understand
that article in PTJ?), "reverse well", "well temperament", and why the 3
string unison is flat from the first string tuned. I forget what they call
that but I have a tuning machine that shows it isn't true.
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