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Back in '80-s I motorised an existing coelostat mechanism (fork mounted mirror, 10" or so in diameter) . I believe it was in use for some time on Zagreb's Astronomical observatory.
The main purpose of using the coelostat is in permanent setup - it requires a lot of space for all the components of the system and it is not very practical if you don't have it and if it is for occasional use only.
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