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Figure 57. Puhler sounder, described by Christian Puhler in 1563, repeated anidea first put forth by Cardinal Nicholas Pusanus a century earlier. Theprinciple, was to attach a float to a weight making it heavier than water. Upon striking bottom, the float would detach. Depth would be derived from round-trip travel time. It is unknown if this device was ever field tested. (Image credit: Oceanographic Museum of Monaco | Y. Berard)