A grazing incidence onehyphen;dimensional focusing collector for use in the extreme ultraviolet is described. The collector has a field of view of 1times;50deg;, a focal length of 3015 cm, and a total unobstructed area of 224 cm2. The instrument employs an interchangeable detector package of either channelhyphen;electron multipliers or proportional counters which yield a limiting sensitivity of 1.0 photons/cm2sec Aring; at 170 Aring; and 0.05 photons/cm2sec Aring; at 90 Aring;, respectively, for one second integrations. The design and calibration of the instrument are described in detail. Data obtained by this instrument during recent rocket flights are presented.
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