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THE 182 CM TELESCOPE: INSTRUMENTATION

DECOMMISSIONED INSTRUMENTS: BOLLER AND CHIVENS SPECTROGRAPH

The Boller and Chivens spectrograph has been equipped with the "Dioptric Blue Galileo Camera" with a focal length of 188 mm and an off - axis parabola collimator with 90 mm of diameter and a focal length of 810 mm.
There is a comparison source, a hollow cathode Fe - Ar lamp, for wavelength calibration.
There are five gratings available for the B&C spectrograph with dispersion ranging from 42 A /mm to 339 A/mm. Gratings can be changed, but the spectrograph must be refocussed after every change. Refocussing can take up to 2 hours and it is therefore not recommended during the nights observing.
In the table the available gratings are shown together with their principal characteristics

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