<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1400" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: = #ffffff" bgColor=#ffffff> <DIV>Hi Bob,</DIV> <DIV> </DIV> <DIV>Thats what i do also first.  (A4-F2, 2 8aves +m3rd)</DIV> <DIV>I proceed then with the sixth F2-D3 to the same beatrate, what is resulting in a pure 12th in D3-A4.</DIV> <DIV>Spacing this 12th equally results the P12 tuning.</DIV> <DIV> </DIV> <DIV> </DIV> <DIV>regards,</DIV> <DIV> </DIV> <DIV>Bernhard</DIV> <DIV> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=BobDavis88@aol.com href="mailto:BobDavis88@aol.com">BobDavis88@aol.com</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, August 20, 2004 = 8:52 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: setting pitch with = a fork</DIV> <DIV><BR></DIV> <DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px = solid"><FONT face=Arial size=2>"I strike the F below the A and listen to the = fork A along with the F. I count those beats. Then I remove the fork and play the = F and the A and count those beats. "</FONT></BLOCKQUOTE></DIV> <DIV>I don't know if the writer really meant literally "the F below = the A", but I also saw a reference in another post to a "F2-A3" comparison = with the fork, so I just wanted to make it clear that although F2, F3, and = F4 will all beat against A4, only the F2 [2 8ves + M3rd] will give an = accurate comparison between an A4 fork and the A4 note on the piano. Here's = why:</DIV> <DIV> </DIV> <DIV>The 5th partial of F2 is approximately equal to the fundamental = of A4. In a tuned piano, it will be about 4 beats flat of both the fork and the = note, but it can be set anywhere comfortable. I like 5 or 6 beats even = better. When A4 on the piano is in tune with an A4 fork, = the beat of either against the F2 beat-producer note will be the same. = This is such a great method because, even as the notes become in = tune, the beats remain in a comfortable range [4 to 6/sec] in which the ear is = amazingly adept at comparison. On the other hand, in trying to match a note directly = to a fork, the closer the match, the slower the beat. And, it never becomes = completely clean, because of beating between harmonics of the source = and "inharmonics" of the piano. Just last Saturday, our Chapter set = an A as a group by the F2-A4 method, and were very quickly able to = agree on a setting which we then measured electronically as being only 0.2 cents = off. That's not bad. By the way, we used an AccuFork. We had a = grand with a sostenuto, which you can use to hold down the F2, = but I also demonstrated playing it and jamming a mute between it and F# to = hold it down, then tuning the A4.</DIV> <DIV> </DIV> <DIV>The 5th partial of ~F3~ on the other hand, is ~A5~, which matches = the desired A4 at its SECOND partial, A5 [a 5:2 match]. The A5 = produced by the fork is harmonic, but that produced by the piano is a little = sharp. Matching this coincidence causes the piano's A4 to be slightly flat. = F4-A4 [a 5:4 match, coincident at A6] would produce an even flatter A4, with = equal beats between the fork and piano.</DIV> <DIV> </DIV> <DIV>I hope that's clear. We're probably all on the same page, but I = just wanted to make sure everyone out there knows why only F2 works accurately.</DIV> <DIV> </DIV> <DIV>Bob Davis</DIV></BLOCKQUOTE></BODY></HTML>