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Absolute measurements of the integrated reflexion for selected planes in calcite, quartz, gypsum, fluorspar and mica have been made using both molybdenum and copper characteristic radiations. An experimental method is described whereby the structure amplitude can be determined in spite of the great variations in the integrated reflexion associated with the different degrees of imperfection found in crystals of the same species. It is shown that it is necessary to use more than one wavelength of X-rays in assessing the degree of imperfection of a given specimen from the value of the integrated reflexion.

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