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![Figure 57 ship4265.jpg Figure 57](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4265.jpg?itok=xGKNaZno)
Description
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)