LXXIX. Microscopic studies on beryl crystals.—III. The movement of dislocations

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Abstract
It is shown that slight anomalies in the layer pattern near a dislocation can often be interpreted only as due to movement of the dislocation over a short distance. Examples are also shown in which a single dislocation has moved and cut across neighbouring layers. Characteristic types of dislocation groups, termed limited slip-zones, which are often observed, are shown to be explicable, in all details, in terms of the ‘generation’ of dislocations by Frank-Read sources. The type of layer structure to be observed while such a source is still active, or has just ceased to be active, is deduced and some of the cases observed are shown.

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