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Abstract
Problems concerning the design, construction and operation of high powered demountable type of valves have been discussed. The actual construction and operation of a pair of medium powered, water-cooled demountable type of valves have been described. The valves described here were constructed in connection with the installation of a high power ultrasonic generator during the last world war when equipment and appliances, specially those pertaining to wireless engineering, were not available in the Indian market.