Figure 42. A BBT-Neyrpic current recorder made between 1950 and 1952 as the
result of a collaboration between the companies of Barbier, Benard & Turenne and
Nepyric. The official test of this instrument was in the Gulf of Sfax about
1951 in four meters of water. This instrument had higher precision and was more
manageable than many of its predecessors, but abandoned photographic recording.