Applications and limitations of thermocouples for measuring temperatures

E. D. Tanzer: Not so long ago, a thermocouple was solely a physicists instrument. At the present time, however, it has a wide field of application among the operating companies. At least, we of the Philadelphia Electric Company, during the past three years have used it extensively in field determinations of the operating temperatures of cable duct lines, cable sheaths and transformer manholes, as well as in research problems pertaining to the operation of an extensive underground cable system.