ARC 07 : A luminous gaseous electrical discharge characterised by high current density and low voltage gradient. The condition of high ionisation is assisted by the volatilisation of the electrodes. A portion of a curved line, as of a circle
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}