Date: Mon, 21 Oct 2002 12:56:26 -0500

Author: Steve Narf

Subject: Re: light the match demo


I wonted to make another set a few year ago. I found some in Edmund
Industrial Optics item#53-875. I then had our shop make the stands. They
work well but I found that they have two focal points. It is possible that
our shop did something in the mounts that made this occur, Don't know.


At 12:25 PM 10/21/02 -0500, you wrote:
>I shared the handouts from this summers demonstration workshop with some
>other physics instructors and they immediately wanted to do several demos
>(two of which we already had) but we don't have the reflective mirrors to
>do PIRA 4B40.10 the light the match demo. Two curved mirrors (circular?
>parabolic?) one with a filament at its focus the other with a match. Turn
>on the current to the filament/reflector located on one side of the demo
>table and the match in the other reflector located at a distance is
>ignited. I recall that this one was discussed at the workshop but do not
>have any source for the reflectors. Does anyone have a source of some
>appropriate reflectors?
>Don Mathieson
>Tulsa Community College

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