<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html xmlns:v="urn:schemas-microsoft-com:vml" = xmlns:o="urn:schemas-microsoft-com:office:office" = xmlns:w="urn:schemas-microsoft-com:office:word" = xmlns="http://www.w3.org/TR/REC-html40"> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; = charset=iso-8859-1"> <meta name=ProgId content=Word.Document> <meta name=Generator content="Microsoft Word 9"> <meta name=Originator content="Microsoft Word 9"> <link rel=File-List href="cid:filelist.xml@01C54A3C.A2B6F680"> <title>Message</title>  <style>  </style>  </head> <body bgcolor=white lang=EN-US link=blue vlink=blue = style='tab-interval:.5in'> <div class=Section1> Barbara-<o:p></o:p> <![if = !supportEmptyParas]> <![endif]><o:p></o:p>= I did a little experiment this past winter with = our 1929 S&S D on our big theatrical stage.  Piano is used as an orchestral and concerto instrument, and for = choral accompaniment.  This is an unusually stable = piano, so I figured I could have pretty straightforward measurements of heat vs. = pitch over time.<o:p></o:p> <![if = !supportEmptyParas]> <![endif]><o:p></o:p>= I measured 6 A’s and recorded the = temperature measured with a thermo/hygro unit sitting on the plate.  First I measured on a dark stage, then turned on the = hot lights.  Biggest change was at = A3—it lost 2.3 cents in the first 10 minutes, then oscillated up 1 cent and back down = .8 cents over the next 2 hours.  = Most other A’s lost about 1 cent in the first 10 minutes, then either gradually = climbed back up (A1 & A6) or stayed fairly steady (A2 & A4).  A5 lost 1 cent in 10 minutes, = then another .9 over the rest of the first hour, then came back up .4 over = the next hour.  I’ll see if = it was in shadow.  The plate = increased in temperature at a fairly linear rate over the 2 hours, starting at 69 = degrees (F) hitting 71.6 an hour later, and 73.4 at hour = 2.<o:p></o:p> <![if = !supportEmptyParas]> <![endif]><o:p></o:p>= So, what Don said:  Let toast 1 hour until golden brown, then = tune.<o:p></o:p> <![if = !supportEmptyParas]> <![endif]><o:p></o:p>= Lawrence Becker, = RPT<o:p></o= :p> Piano Technician<o:p></o:p> College-Conservatory of Music<o:p></o:p></sp= an> University of Cincinnati<o:p></o:p></sp= an> = <![if = !supportEmptyParas]> <![endif]><o:p></o:p>= -----Original Message----- From: Barbara Richmond [mailto:piano57@flash.net] Sent: Monday, April 25, = 2005 9:44 PM To: College and = University Technicians Subject: Re: [CAUT] = pitch under the lights <![if = !supportEmptyParas]> <![endif]><o:p></o:p> Don,</fo= nt><o:p></o:p>=  <o:p></o:p>= Thanks, for your advice.  That's how I'll do it.  This is my first = season here and so far, the set ups and uses have all been different--so = I've been learning how the piano reacts (no complaints *yet*-- thanks = to the head's up I got in Guy Nichol's class in Nashville).  At my last = gig, lighting wasn't an issue.  Oh, for those days!<o:p></o:p>=  <o:p></o:p>= There's no= problem getting the piano pre-heated.  But since it's not first on = the program and will be closed up and sitting off stage for a while, I wondered how the lag time would affect = it.<o:p></o:p>=  <o:p></o:p>= Barbara Richmond<o:p></o:p>  <o:p></o:p>= PS  How long does it take a hot piano to go back up in pitch?  (Not a = joke, just a question.)<o:p></o:p> <div style='border:none;border-left:solid black 1.5pt;padding:0in 0in = 0in 4.0pt'> <![if = !supportEmptyParas]> <![endif]><o:p></o:p>= </div> </div> </body> </html>