Re: [ATM] Foucault Slit

[James P Crombie <jpcrombie@pei.eastlink.ca>]

another razor blade ??

Rich Ball wrote:

>Is there any common object that can be used to calibrate the slit-width on
>the Foucault light source?  Should it be as wide as a the cover on a book of
>matches?  (Too wide, I think.) As wide as a standard pin?  As wide as the
>shaft of a push-pin?  etc. etc.  How wide is too wide?  I suppose there is
>no "too narrow."
>
>Thanks for thoughts on this.
>
>My tester has a slit formed by 2 single-edged razor blades held in place top
>and bottom by tinnerman nuts.  It's easy to adjust.  I just don't have clear
>idea of what it should be.
>
>--Rich Ball
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>
>  
>

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