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Its Coude focus is used with a room sized specrograph.
In 1962 another optical telescope, a 48 inch reflector fitted with a Coude focus and a room sized spectrograph, was added to the Dominion Astrophysical Observatory in Victoria.
That was possible: although the telescope had a Coude focus which allowed him to work in the ship's air most of the time, it was occasionally necessary for him to exhaust the dome, and for that purpose he had a space suit.
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