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This paper deals with the high-voltage (1·5 MV) Toulouse electron microscope and contains some unpublished information about the objective lens and the column of the instrument. Some examples are given of the advantage of working at very high voltages; in particular the increase of resolving power and the spectacular reduction of chromatic aberration are pointed out. A few micrographs give an idea of the results obtained with this microscope.
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Gaston Dupouy (1969) studied this question.
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