Lang diffraction technique

A.R.LANG, in Modem diffraction and imaging techniques in materials science, eds. S. AMELINCKX, R.GEVERS J.VAN LANDUYT, Vol. 2 (North-Holland, Amsterdam, 1970) p. 623. ... 

Lang (1956a,b) attempted a complete map of the diffracted intensity, but was handicapped by the low resolution inherent in the use of counter techniques with fibrous materials. Although quantitative data are highly desirable, they are very difficult to obtain from fibrous materials of large period. Measurements of meridional intensities in various keratins reported by Onions et al. (1960) are of considerable interest in comparative studies, but cannot be used to check structures because the slit collimation used does not differentiate between meridional and near-meridional reflections. The same difficulty applies to the intensities quoted by Bear (1944). 

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