Abstract
The results of the experiments of G. P. Thomson on the transmission of electrons through thin films are discussed. It is suggested that the explanation in terms of the Debye-Scherrer is untenable in certain cases. In particular for the case of celluloid films, and amorphous films generally, it is suggested that scattering ofm the echanical waves at centres might account for the observed results. Calculation shows that the distance apart of the scattering centres is of the order of the distance between atoms. An analogy between this case and that of X-rays (Keesom and Smedt) is made, and it is shown that the test between a scattering and a origin of the rings is the relative diameters of the rings. A brief announcement of another diffraction experiment is made.
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