<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR><DIV><DIV>On Apr 28, 2007, at 10:57 PM, Tim Coates wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I think Jeff Tanner asked a question that was interesting.<SPAN class="Apple-converted-space"> </SPAN>There was a lot of discussion about crushed bridge surface causing the pitch to drop, but then the thread changed to wire stretch causing the pitch to drop.<SPAN class="Apple-converted-space"> </SPAN>I thought his question was: which is it? <SPAN class="Apple-converted-space"> </SPAN>I don't believe I've seen anyone answer his question yet.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Tim Coates</DIV> </BLOCKQUOTE></DIV><BR><DIV>Hi Tim,</DIV><DIV>I didn't mean for it to sound like "which is it?" More of a challenge to the idea that wire elongation or "stretching" was of little factor.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>The idea was brought forth by Fred and Ron that the pitch drop that happens after new wire is installed has little to do with wire elongation or stretching, but due almost completely to wire bending to conform to bearing points and the crushing of the bridge cap. (My paraphrased understanding after having read it several times)</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>We all agree that these occurrences do affect pitch drop, but the idea that elongation has little to do with it, didn't make sense to me, since both wrapped wire and plain wire both go through those processes alike, yet plain wire continues to drop in pitch long after the wrapped wire seems to stabilize. Regardless of the reasons why one stabilizes sooner than the other, the fact that plain wire continues to drop in pitch seems to indicate there is a great deal of elongation that happens in the process.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Jeff</DIV><BR><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV>Jeff Tanner, RPT</DIV><DIV>University of South Carolina</DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></BODY></HTML>