A description is given of a soft X-ray spectrometer which uses a Be-Cu photomultiplier as detector. Unlike most spectrometers of this type it is not a modification of a previously existing photographic instrument, but was designed specifically to take advantage of the new technique. In particular the photo-detector is made to move around the Rowland circle by the simple expedient of mounting it on a radial arm. Its method of use is described and the emission band spectra of Al, Mg, Na and Li are given as examples of results obtained with it.
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Jacob et al. (1960) studied this question.
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