What I want to do
Fix my spectrometer (I only see a white light instead of an emission spectra)
My attempt and results
Built it, observed no emission spectra and instead saw a bright white light; tried to block out light getting into the box, that did nothing; tried letting more light in the box (from the sides instead of the slit), strangely, that lets me see what looks like an emission spectra at an angle.
Questions and next steps
Why do I see a bright light? Based on a question from Liz Barry in a google groups post I'm guessing I messed up the DVD insertion step, but I'm not sure what the next step is in fixing it.
Why I'm interested
Because I want to fix my spectrometer.
You may notice in the image that my box looks like it can't completely close. It doesn't (whoops). It does get really close, and I wrap the fabric from a pair of heavy black jeans all the way around the box (except the opening where I want light to come in!), and it does seem to block all residual light.