[Physltest] [Phys-L] Re: 'Seeing' frequencies above 30-40Hz (fwd)

[Bernard Cleyet <anngeorg@PACBELL.NET>]

In my criminal student days, I looked (o'scope from USC) at the signal
necessary to obtain a dial tone on a pay 'phone.  I found I could
duplicate it by shorting the line by scratching a file, di dah, with a
wire.

bc


Herb Gottlieb wrote:

> 1. Rub the edge of a file card over the teeth of a picket comb.
> The speed of the card movement will correlate with the pitch
> of the sound created.
>
>
> -- Brian Whatcott <betwys1@SBCGLOBAL.NET> wrote:
> At 12:05 PM 1/12/2005, you wrote:
>
>
> > Hi,
> > "...changing the rate of vibration can vary the pitch of a
> > sound."
> > ///
> >        Does anyone have a low-budget activity in which one can experience
> > the relationship between rate of vibration and pitch?
> >
> > Thanks!
> > Mark Lucas
>
>
> I visualized a metal strip, perhaps end-loaded, so that at full length,
> it oscillates at just a few Hertz, but when a stopper is run up its
> length to shorten it, the strip might blur visually but become audible.
>
> The inference might be straight-forward?
>
>
> Brian Whatcott    Altus OK    Eureka!
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