---------------------- multipart/alternative attachment On Jan 9, 2006, at 10:57 AM, BobDavis88@aol.com wrote: > Not meaning to embarrass anyone, but just to avoid confusion to =20 > those learning the trade, this is not correct. A perfectly tuned =20 > 440 A4 on the piano produces a second partial which is slightly =20 > sharp of 880. IF the fork produces 880 at A5 (which has recently =20 > been called into question), we would have to bring A4 DOWN (under =20 > 440) to match its 2nd partial to the fork's 2nd partial. > > Bob Davis Who just said this subject was easy? 8^) Let's see if I can get it right. Here are a few readings taken this =20 morning of a John Walker A fork and a Yamaha grand. They show that =20 Bob is correct. No obfuscations. No smoke and mirrors. The first attached graphic shows an RCT Pianalyzer readout of an A4 =20 tuning fork. Note that the Inharmonicity column shows uniformly zero =20 inharmonicity. =EF=BF=BC The second attached graphic shows an RCT Pianalyzer readout of a =20 piano's A4. If the 2nd partials from the two graphs were tuned =20 together (as would be the case using F3 as a test note to tune the =20 two together), then there would be a 1.2 cent offset at the =20 fundamental. That is, if the piano A's 2nd partial were tuned down to =20= match the 0.0 of the fork's second partial, then the piano's A would =20 be flat by 1.2 cents. If this were on the PTG tuning exam, the examinee would have used up =20 a substantial portion of the tolerance in doing so. Please use F2 to =20 match the fundamentals of the pitch source and the piano's A when =20 setting pitch. =EF=BF=BC Kent ---------------------- multipart/alternative attachment --Apple-Mail-15--392538181 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/f2/bb/5b/bc/attachment.htm --Apple-Mail-15--392538181 A non-text attachment was scrubbed... Name: forka4.jpg Type: image/jpeg Size: 31619 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/a8/db/f5/cf/forka4.jpg --Apple-Mail-15--392538181 A non-text attachment was scrubbed... Name: pianoa4.jpg Type: image/jpeg Size: 29354 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/43/9b/84/ce/pianoa4.jpg --Apple-Mail-15--392538181-- ---------------------- multipart/alternative attachment--
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