Abstract
The migration of metal from the anode to the cathode and that from the cathode to the anode of an electrical contact have been measured over a range of low circuit inductance extending down to values of the order of 10-8 H. The method depends upon making one electrode radioactive and assessing the quantity of material from this electrode deposited on the other by operating the contact. The contact metals considered are silver, platinum and platinum-iridium alloys. Even at the lowest values of inductance, the transfer of metal depends on the inductance. This indicates the decisive role played by the micro-arc which occurs at the breaking of the contact.
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