a suggestion to make these things work better:
build the entire ring out of 1 piece of metal, by bending all the sections. That way there's only 1 gap to worry about making good contact. It will be more work at the beginning, but way easier in the long run.
EDIT:
I also suggested to David that you could use a lens with an interference pattern to see the interference pattern. Perhaps as simply as placing 2 cheapo fresnel lenses on top of each other and offsetting the center point. Or 2 window screens. Or maybe even multiple polarizing lenses with lines of polarization at differing angles.
build the entire ring out of 1 piece of metal, by bending all the sections. That way there's only 1 gap to worry about making good contact. It will be more work at the beginning, but way easier in the long run.
EDIT:
I also suggested to David that you could use a lens with an interference pattern to see the interference pattern. Perhaps as simply as placing 2 cheapo fresnel lenses on top of each other and offsetting the center point. Or 2 window screens. Or maybe even multiple polarizing lenses with lines of polarization at differing angles.
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