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From: Pat Missin
Date: Fri, 18 Jun 1999 18:39:42
Subject: Re: Sirens and a small spanner

Douglas Tate wrote:
>
>But before you dismiss the idea, lets see if anyone else has heard this
>irritating phenomenon.

Well, I must admit that I have never heard the thing you describe. I have
sometimes had valves that vibrate, producing a pitch an octave below that
of the reed, but as you were doing this stuff before I was born, I guess
you are familiar with this particular phenomenon and are describing
something different.

I have noticed sympathetic vibration with plucked reeds and it it not
limited to octaves. The effect is quite noticeable when plucking a reed on
a loose reedplate (the effect is even more noticeable on a kalimba/mbira,
where there is a soundbox to amplify the vibrations), but I find that it is
much less noticeable when the reedplates are actually mounted on the
harmonica. And I have to say that I have never noticed any sympathetic
vibration whilst playing the thing. I have no doubt that it does happen to
some extent, but I can't hear it happening to any significant extent. If it
did, I think it would probably mess me up when I am tuning higher limit JI
intervals. I guess it would be easy enough to test, but also I guess that
any tests would be subject to similar criticism as the SPAH and BHF
materials tests...

>I hope to goodness I don't have to borrow Bobbies beeswax or Pat's nail
>varnish

Get your own nail varnish!!

(BTW, I'll have some more to add on the topic of ringing reeds before too
long...)

-- Pat.