Key points are not available for this paper at this time.
The esse nti a l features of the electron-optical shadow method for the quantitative mapping of magnetic fi elds are presented in unified form . The processes of obtaining and analyzing the shadowgrams are given in so m e detail. Iterative procedures of analysis, which have proved successful in practice, are illu strated by the mapping of an otherwise inaccessible ferromagn etic domain fi eld. Sections 5 and 6 give an analytical method, involving inversion of integral operators. The m ethod, although it has not yet been applied to the analysis of shadowgrams, is given because of its generality and applicability to the eq ui"alent problem of interpretation of fluid dynamic interferograms.
Marton et al. (1954) studied this question.