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Published online by Cambridge University Press: 10 January 2013
Occasional gaps in diffraction arcs are to be expected on “powder films” obtained with the Gandolfi X-ray camera, particularly when the specimen is a single crystal of low symmetry. The geometrical limitations of the method were succinctly and elegantly stated by the worker whose name the camera bears, in work published a quarter of a century ago. Gandolfi also stated a meansibr amelioration of the missing reflections “problem” Numerous authors have made reference to such discrepancies in the intervening period. These minor difficulties notwithstanding, the Gandolfi camera remains a powerful tool for materials analysis.