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 fix the weak point of the preceding model that was not able to execute a sole measurement at a given depth.

Image ID: ship4004, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco

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