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An electrostatic generator of the Van de Graaff type has been developed which operates in a large steel tank under an air pressure up to 45 lbs. The maximum steady voltage obtained was about 750 kv. In applying this voltage to an evacuated tube for acceleration of protons the usable voltage is limited by the dimensions of the present tube to about 400 kv. The apparatus has given satisfactory service during a year of use in nuclear disintegration work.
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Herb et al. (1935) studied this question.
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