Re: What's this?
We had a sodium vapour lamp in the physics labs when I was at school, for experiments in optics -- spectroscopy and the like, or when a monochromatic source was required. The same ballast gear could also power a cadmium vapour lamp, which emits several different narrow lines that can be seen clearly. I remember the latter having a brilliant "electric blue" colour. Probably far too dangerous to be obtainable today .....
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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