Wind pitch VS Strings

[David Renaud]

   Brass  goes sharp not flat as they warm up,as do
woodwinds, and organs. The opposite of strings. 
It does have something to do with air density. 

    Tuning a  piano to organ I have measured pipes
before and after lights on for 15 min. finding
a 3 cent spread from A 439.25 to A440 over time.

  Woodwinds are not stable with temperature change.
 My clarinet cold from outside in winter is easily
A438, and requires much jaw pressure to force it up to
A440 with a standard 66mm barrel. When very warm from
heavy playing it is easily at A442 if played with the
same pressure. Lowered jaw, open(better sound) and
additionally pulling the barrel out a few thousandths
is required for A440. 
 This is a 16 cent spread...enormous.

  I often perform in pit orchestra for theatre. 
Occasional long breaks for theatre dialogue see
the low cold pit cool things down enough that all
of us(including the oboe player) must be very careful
to work up to pitch after a 5 min pause, then open
up as things warm.

  For those that know me as a technician...
also I play all the clarinet family, saxophones,
flutes, recorders, and get to perform allot still,
including Pops concerts with Canada's NAC orchestra,
and many other varied functions.......
  My Jazz Band site is .....  drjazz.ca

                         Cheers
                         Dave Renaud
                         RPT
                         Canada
 

















   









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