Figure 58. Albert sounder. The idea of Cardinal Cusanus, mentioned
in the previous figure, was re-examined by the Italian architect Leo Battista
Alberti and subsequentlydescribed by Giuseppe Biancani in 1635. The design was
even simpler than Puhler's device. A simple rule of three was devised to derive
the depth from the travel time to the bottom and return of the float.
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