Abstract
The construction of a 6.650 m in plane Eagle-mounting vacuum spectrograph is described. A concave grating (blaze angle of 5°10′) with 1200 lines a mm is used. The plateholder can rotate around the slit by means of a system of levers. The platechamber volume is separated from the main vacuumchamber by means of a rectangular separation valve. Optical adjustment is very critical and well reproducible. Various lightsources have been used. Several spectra have been photographed and measured. Some of the results are briefly discussed.
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