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The `moving electrode' method and fast oscillography have been used to obtain a value of 8 V±6% for the cathode fall in potential of mercury arcs at 10 A. With the known electrode speed the cathode fall space was estimated to be less than 5 × 10 −4 mm. The results agree satisfactorily with theory.
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Boylett et al. (1971) studied this question.
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