A method for detecting and locating constrictions in electrical conductors of predetermined normal cross-section. A test or reference resistance reading is made and stored pursuant to application of a test current, a stress current is applied, heating any constriction in the conductor, a resistance reading...http://www.google.co.uk/patents/US5568055?utm_source=gb-gplus-sharePatent US5568055 - Adiabatic conductor analyzer method and system
