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I idly remarked that I recalled that the metal pipes are uniquely
temperature
sensitive.
He agreed of course, remarking that the tone is flat at low
temperature,
and so he would turn on the heating until the temperature reached
about 70
degF then switch to air conditioning.
Caught unawares, I offered (wrongly) that surely pipes would be sharp
at low
temperature?
He reminded me that temperature (and humidity too) determine c in air
(of course...).
Ethernet!
Brian Whatcott Altus OK