sounding board structure and displacement

[Michael Gamble]

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Hello List and Mark K
In your post you said (inter alia): "The purpose of the 'downbearing' in =
bowed string instruments is to hold the bridge in place, hold the =
strings in place, and to ensure that the bridge thoroughly defines one =
end of the vibrating string.  Perhaps this is also=20
the case in pianos." Or perhaps not. The strings are kept firmly in =
place not so much as by the downbearing as by the bridge pins. In the =
stringed instrument there is also a "rib" - the "bass bar". This goes =
with the grain of the belly and is there to stop the collapse of the =
belly. It is assisted by the "sound post" which is, like the bridge, =
only held in place by friction and transmits the sound waves to the back =
of the instrument. In the piano we only have one sound board. Some =
pianos even have "wolf notes".... (the so called "killer 8ve.")
This gets us nicely away from those Automotive Analogies - or AA  :-)
Somebody ought to invent the equivalent of "string adjusters" for the =
piano. Think of it! You turn up to tune a piano and merely have to =
twiddle (or Noodle) the string adjuster on each string... The mind =
boggles. (or is it Noodles?) <G>
Regards from a gusty dark Sussex.
Michael G (UK)

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