I am in the process of fixing a Hartridge Reversion Spectroscope I bought it off eBay recently that shows only one spectrum.
After I took off the cover of the eye piece, I have found a 3/4 round shape glass that was half shattered. Does anyone knows if it is just a plain piece of glass with a black line in between to separate two spectrums, or is it a polarising/ diffraction grating filter?
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