Abstract
The shape, number and arrangement of spots are studied on electron diffraction photographs of beaten gold foil. Various disturbing effects, including preferred orientation and refraction, on the deduction of particle size by spot counts are considered. After allowance for these a particle size of 1500 ? ? 50? is obtained. Streaks and displaced spots are explained in terms of crystals with lamellar shapes and stacking faults on (111) planes. Heavily faulted lamellae of thickness less than 150 ? and lamellar regions of hexagonal close packed gold are both found to exist.
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