Date: Fri, 12 Nov 1999 15:22:44 -0500

Author: Gerald Zani

Subject: Re: Resonance Demo


The strobe light makes sense. Without the strobe it could not be visible. JZ

At 12:27 PM 11/12/99 -0700, you wrote:
> We've talked about this demo before, and I think someone even had a
>picture of it posted on a webpage. Can't remember who or where it was
>though. But I do remember that the box was made of plexiglas, and I don't
>recall any chambers. The glass plate rested on two supports at either end.
> I remember only one opening in the box, and it was where the speaker was
>mounted, either above or below the glass plate, centered on the plate. A
>strobe was used to show the magnitude of the plate's oscillation, which
>turned out to be an inch or two...
> Jerry D.
>At 10:16 AM 11/12/99 -0700, you wrote:
>>Jerry, read Mike Ugawa's letter closer!
>> He is talking about shattering a strip of glass 4-6" wide by 24-30"
>>long. I don't know where he saw this demo but I want to know more. A strip
>>of plain window glass should flex like hell before it broke.
>> I can see how this is done but the drive mechanism escapes me at this
>>point. As I think about it, it should be relatively easy to do and a great
>>improvement over wine glass'. My faculty seem hellbent on blowing the $105
>>diaphram in the speaker every tiime its used. Zig
>>Zigmund J. Peacock Voice 801 581 6602
>>115 S 1400 E RM 201 Email
>>SALT LAKE CITY UT 84112-0830
> Jerry DiMarco, Instructional Lab Supr. ph: 406-994-6161
> Physics Dept., Montana State Univ. fax: 406-994-4452
> Bozeman, MT 59717-3840 e-mail:

Gerald Zani
Lecture Demonstration Technician
Dept. of Physics #1843
Brown University Phone: (401) 863-3964
Providence, RI 02912 Fax: (401) 863-2024

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