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This paper describes an investigation of the origin of moiré patterns which occur in display‐type lowenergy electron diffraction apparatus. With both planar and spherical geometry, ``real'' multiple source moiré patterns have been observed. With planar geometry, quantitative comparison of experiment and theory for the average moiré fringe spacing and pattern location are shown to be in good agreement. Spherical geometry patterns can be understood qualitatively on the same basis.