A system for measuring the depth of a fluid body consisting of omitting a signal from a position below the fluid level and in a direction that reflects a double inversion of direction between the upper and lower surfaces of said fluid and a returning said signal to approximately the position from which it was emitted detecting said signal and measuring the time delay between transmission and reception thereof as an indication of the distance between said upper and lower surfaces of the fluid. (Machine-translation by Google Translate, not legally binding)
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