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

[Bernard Cleyet <anngeorg@PACBELL.NET>]

I have a coupala Atwood machines * from the turn OTC (19th) that uses
such an oscillator on waxed tape to which the weights (masses) are
attached.  No one has mentioned the phonodike or manometric flame?

bc, answering before having read all the thread

p.s. one could have the heavier weight drop thru a column of liquid to
obtain a constant speed.




* gift of UCB.

Ludwik Kowalski wrote:

> On Wednesday, Jan 12, 2005, at 15:07 America/New_York, Scott Goelzer
> wrote:
>
>
>
> > Tuning a strobe to nearly match the frequency is always impressive -
> > show the tuning fork is really moving as it makes the sound.
>
> Did somebody mentioned a large tuning fork with a needle rigidly
> attached to one of the prongs? Drag the needle rapidly over a sooty
> glass (after keeping glass above a candle flame) without pressing too
> much. I remember seeing this somewhere. A wiggly line will be produce.
> I suppose a common motion detector can be used to measure the speed at
> which the hand holding the fork is moving (for example, 500 millimeters
> per second when f=256 Hz).
> Ludwik Kowalski
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