Figure 45. Rung bathometer, designed by Captain George Rung of the Danish
Meteorological Institute. It was a new type of pneumatic sounding device based
on the principle advanced by the physician Kristian Prytz, also a Dane. It was
considered an advancement on the Thompson tube. Depending on modifications, it
could be used from 0 to 200 meters, or from two to three times deeper.
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