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![Figure 3 ship4004.jpg Figure 3](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4004.jpg?itok=heiIJVrE)
Description
Figure 3. H. Fol and E. Sarasin photometer, 1885 model. From top to bottom -Device closed; device open; the surface float. This model was designed to fixthe weak point of the preceding model that was not able to execute a solemeasurement at a given depth. (Image credit: Oceanographic Museum of Monaco | Y. Berard)