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Can you post a couple of photos?
I've got some old books on spectroscopes/ spectroscopy which may have some info, but probably no detailed drawings...
The Hartridge Reversion scopes work by displaying two spectra in the ocular. The two spectra are arrayed in opposite directions one a mirror image of the other. You decide which line or band you want to know about and you turn the micrometer till the same band on both spectra are lined up adjacent to one another. Then you look at the micrometer and read the wavelength to 0.2nm.
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