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Kent - What a great discussion this is. What is most amazing to me
is how you got those graphics into your computer and to us. <b>How
did you do that???</b><br>
<br>
Don<br>
<br>
Kent Swafford wrote:
<blockquote cite="mid7C792E8D-F3CD-477A-924C-A49A65430936@earthlink.net"
type="cite">
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<div>On Jan 9, 2006, at 10:57 AM, <a href="mailto:BobDavis88@aol.com">BobDavis88@aol.com</a>
wrote:</div>
<blockquote type="cite">
<div style=""><font class="Apple-style-span" size="4"><span
class="Apple-style-span" style="font-size: 16px;"><font
class="Apple-style-span" face="Bookman Old Style">Not meaning to
embarrass anyone, but just to avoid confusion to those learning the
trade, this is not correct. A perfectly tuned 440 A4 on the piano
produces a second partial which is slightly sharp of 880. IF the fork
produces 880 at A5 (which has recently been called into question), we
would have to bring A4 DOWN (under 440) to match its 2nd partial to the
fork's 2nd partial.</font></span></font></div>
<div style=""><font class="Apple-style-span" face="Arial" size="4"><span
class="Apple-style-span" style="font-size: 16px;"> </span></font></div>
<div style=""><font class="Apple-style-span" size="4"><span
class="Apple-style-span" style="font-size: 16px;"><font
class="Apple-style-span" face="Bookman Old Style">Bob Davis</font></span></font></div>
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<div>Who just said this subject was easy? 8^)</div>
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<div>Let's see if I can get it right. Here are a few readings taken
this morning of a John Walker A fork and a Yamaha grand. They show that
Bob is correct. No obfuscations. No smoke and mirrors.</div>
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<div>The first attached graphic shows an RCT Pianalyzer readout of an
A4 tuning fork. Note that the Inharmonicity column shows uniformly zero
inharmonicity.</div>
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<div><img src="cid:part1.02050605.08080704@twol.com"></div>
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<div>The second attached graphic shows an RCT Pianalyzer readout of a
piano's A4. If the 2nd partials from the two graphs were tuned together
(as would be the case using F3 as a test note to tune the two
together), then there would be a 1.2 cent offset at the fundamental.
That is, if the piano A's 2nd partial were tuned down to match the 0.0
of the fork's second partial, then the piano's A would be flat by 1.2
cents.</div>
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<div>If this were on the PTG tuning exam, the examinee would have
used up a substantial portion of the tolerance in doing so. Please use
F2 to match the fundamentals of the pitch source and the piano's A when
setting pitch.</div>
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<img src="cid:part2.09070404.01030201@twol.com"><br>
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<div>Kent</div>
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