| 摘要 |
795,473. Spectrometers. PARSONS & CO., Ltd., C. A. March 20, 1956 [April 18, 1955], No 11109/55. Class 97(1) [Also in Group XL (b)] Mirrors of the form M, see Fig. 1b, are used in conjunction with apertured rotary disc D in a spectrometer (see Group XL(b)) to direct radiations alternately from beam paths A, B on to monochromator entrance slit S. Specifications 666,270, and 790,434 [Group XL(b)] are referred to
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