Summary The elementary concepts of crystal dislocation theory—in particular the Burgers vector, perfect and imperfect dislocations, sessile dislocations, extended dislocations, twin and twinning dislocations—are defined in a manner independent of particular crystal lattices or models or special orientations of the dislocation : and it is shown how their essential properties arise, in so far as they are independent of the particular crystal in which they occur.
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F. C. Frank (1951) studied this question.
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