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Published online by Cambridge University Press: 30 March 2016
A review is given of some modern developments in X-ray astronomy. Improved designs of proportional counters and other detectors are described. We further enumerate developments in solar X-ray spectrographs and heliographs, like the ‘gutter’ spectrograph, and the paraboloidal-hyperboloidal frustrum mirror system, the zone plate technique. We also give a review of instruments and collimating techniques for the detection of non-solar celestial X-ray sources.