Acoustic wave system to measure depths with accuracy (Machine-translation by Google Translate, not legally binding)

摘要

Acoustic sonar system means for initiating a signal wave f means for receiving said signal wave after reflection thereof from a surface for determination of the distance as indicative of the time delay between said transmission and said reception and means for advancing or retarding the initiation of said signal wave in response to changes in position of said probe with respect to said surface. (Machine-translation by Google Translate, not legally binding)