The theory of cathodic protection is established on sound scientific principles and its practical effectiveness is now widely recognised. Substantially similar conclusions have been reached by nearly all investigators, although the technique of application may vary very considerably. Here the author discusses in outline cathodic protection in relation to some of the methods of investigation. Next month will continue with the development of specialised equipment which has become available and the practical applications and limitations. Cathodic protection is not yet an exact science, being more of an art which requires considerable experience for its successful prosecution.
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