The piano will be cooler when measured inside the lid because of the specific heat capacity and thermal conductivity of cast iron. The iron will be cooler than the surrounding air probably lowering the temperature just slightly under the lid. David Love www.davidlovepianos.com -----Original Message----- From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Fred Sturm Sent: Wednesday, December 16, 2009 4:34 PM To: College & University Technicians Subject: Re: [CAUT] temperature and pitch On Dec 12, 2009, at 12:52 PM, Jeff Tanner wrote: > Yes, your D/C system was operating all along, which is why wonder if > the inside of the piano was affected as much by a 10 degree change > outside. Today I tuned a Steinway B with a double tank D/C system installed. It has an undercover, and the lid was closed (covered with Christmas decorations) and stayed that way while I tuned it. I placed my Mannix CMM880 thermo-hygrometer on the plate as far as I could reach. It measured 70.3F. I placed it on a table next to the piano. It measured 71.0F. I repeated a couple times while tuning to be sure, leaving it in each location for several minutes. No mistake. I'm guessing the D/C rods did not add significantly to the temperature of the plate. I don't think there is any real significance to the piano being cooler - probably something to do with heating system cycling, and the air inside the piano being static. But I think my earlier assessment was correct: the D/C produced heat was not a significant factor. Regards, Fred Sturm University of New Mexico fssturm at unm.edu
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