Some Properties of the Hydrogen Arc

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Abstract
The gradient E, total voltage e, and current density I in the one‐atmosphere hydrogen arc between pure carbon electrodes in the 0–10‐ampere range are measured by an oscillographic method. An abrupt change in e takes place at 2 and 0.6 ampere, and in E at 2 amperes, leading to the identification of three states of the hydrogen discharge in this current range and pressure. Rapid motion pictures of this arc at pressures above atmospheric show violent arc movements originating from convection forces. The exponent of the E‐i relation is found to be 0.70 for the normal arc state at p = 1 atmos.

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