In circuits operating with small steady currents which themselves are unable to ignite or sustain any arc, transient arcing may nevertheless appear during switching operations, and may produce a detrimental wear when frequently repeated. These transients appear when their current supply is dependent on capacities and inductances, the energies of which are soon consumed by the discharges. An extended investigation of transients in telephone switching circuits was published by Curtis  in 1940. His description is clear and concise and for details the reader is referred to his article. Figs. (52.01 to 52.04) are due to Curtis. They represent typical appearances of so-called discharge transients.
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© Springer-Verlag Berlin Heidelberg 1958