Das Hochperioden-Überlagerungslot, ein Universallot hoher Empfindlickeit

A high-periodic echo-sounder is described which, by means of a transformation of frequency within the receiver enables the sensitivity of sounding to be considerably increased. This is a noteworthy step towards the solution of the problem of fulfilling all demands of navigation with regard to the measuring of small, medium, and great depths by means of a single high-periodic echo-sounder without undue claboration of apparatus.