Figure 38

Figure 38. Percussion current meter invented by Julien Thoulet. Top: Number 99 0610. Bottom: Number 99 0611. When the helix turned it caused a striker to fall on a steel plate. The sound of this was recorded by a hydrophone and the number of recorded sounds per unit time was directly related to current strength . This was tested off Monaco by Dr. Jules Richard in 1921.

Photo Category: Oceanography - Historical instruments

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Author: P. Roggero/Oceanographic Museum of Monaco/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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