<div dir="ltr">Whoa whoa whoa... <div><br></div><div style>When outside temperature goes down in the winter in northern climates like Philly, heat from the furnace dries the air, causing wooden things evaporate moisture and so shrink, which causes the piano to go flat. Vice-versa in the humid northern climate during the summer. This air drying due to furnace heat is due to warm air having increased capacity to hold moisture. Winter outdoor humidity may be 50% and 10°F, but when that air is heated to around 70°, the indoor relative humidity drops dramatically because that now-warm air can hold more moisture.</div> <div style><br></div><div style>On the other hand, as one respondent attempted to explain... if you tune a piano, then heat a metal string(s), e.g. with a blow dryer, the string will expand and the pitch will go flat. That is the principle used by that self-tuning piano. The piano is manually tuned sharp initially, then the self-tuning feature attempts to bring each string to proper pitch by heating the wire by introducing electric current to cause it to heat.</div> </div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Feb 24, 2013 at 10:16 PM, <span dir="ltr"><<a href="mailto:Jlmatt@aol.com" target="_blank">Jlmatt@aol.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <u></u> <div style="font-size:10pt;font-family:Arial"><font color="#000000" face="Arial"> <div>No Wim and Marshall, it's the opposite! Read what you wrote before you click "send"! </div> <div> </div> <div>Jean-Luc</div> <div> </div> <div> <div>In a message dated 2/24/2013 6:47:43 P.M. Mountain Standard Time, <a href="mailto:tnrwim@aol.com" target="_blank">tnrwim@aol.com</a> writes:</div> <blockquote style="BORDER-LEFT:blue 2px solid;PADDING-LEFT:5px;MARGIN-LEFT:5px"><font style="BACKGROUND-COLOR:transparent" color="#000000" face="Arial"><font color="black" face="Arial, Helvetica, sans-serif"> <div><font style="BACKGROUND-COLOR:transparent" face="Arial, Helvetica, sans-serif">Yes, Marshall, the pitch of a piano does go sharp when the temperature rises, or goes flat when the temperature drops. You understand, of course, only if the temperature in the room in which the piano is goes up or down. The pitch also goes up or down depending on the humidity level in the room. </font></div> <div> </div> <div>Isn't this something sort of basic that your learned in school? So why do you ask?</div> <div> </div> <div>Wim</div> <div></div> <div style="CLEAR:both"> <div> </div></div> <div></div> <div></div> <div style="font-size:10pt;font-family:arial,helvetica">-----Original Message-----<br>From: Marshall Gisondi <<a href="mailto:pianotune05@hotmail.com" target="_blank">pianotune05@hotmail.com</a>><br>To: pianotech <<a href="mailto:pianotech@ptg.org" target="_blank">pianotech@ptg.org</a>><br>Sent: Sun, Feb 24, 2013 3:28 pm<br>Subject: [pianotech] pitch of a piano<br><br> <div> <div dir="ltr"><font size="3" face="Arial">Hi Everyone,</font><br><font size="3" face="Arial">I thought the pitch of a piano rises when the temp rises or goes sharp and when it's cold goes flat? </font><br><font size="3" face="Arial">Marshall<br></font><br><br><em><font size="3" face="Arial">Marshall Gisondi</font></em><br><em><font size="3" face="Arial">MARSHALL'S PIANO SERVICE</font></em><br> <em><font size="3" face="Arial"><a href="tel:215-510-9400" value="+12155109400" target="_blank">215-510-9400</a></font></em><br><em><font size="3" face="Arial"><a title="http://www.phillytuner.com/" href="http://www.phillytuner.com/" target="_blank">http://www.phillytuner.com</a> </font></em><br><br></div></div></div></font></font></blockquote></div></font></div></blockquote></div><br></div>