Re: Sound and Hearing Workshop

[brian whatcott <inet@intellisys.net>]

At 20:16 11/2/97 +0000, you wrote:
> We are looking for materials for a workshop for elementary inservice
> teachers on wavemotion, sound and hearing.  Any ideas ?
>
> Thanks,
> Gerald Hart
There is a standing-wave topic that haunts my imagination, never 
having seen it: the sand patterns on vibrating plates - a technique
due to Chladni (1787). I dare say that the violin bow would be 
replaced by a piezoelectric speaker these days.

 One also reads of pith balls being violently agitated by bell mouths.
 A dog whistle would be an interesting exhibit.

It always piqued my imagination that the fundamental prime mover
of a siren was the disk with oblique holes able to rotate on a 
fixed disk with inversely oblique air jets.

I suppose that being subject to falling bombs  rather cements the
principles of the devices that heralded them...

 It could be that there is mileage to be had from 'cracking the whip'
whose crack is ascribed to sonic speed.

Sincerely,

brian whatcott <inet@intellisys.net>
Altus OK