Figure 1. H. Fol and E. Sarasin Photometers. 1. 1884 model.2. and 3. 1885 model. 4. and 5. 1886 model as publishedin Fol and Sarasin, 1887. Photometers are instruments to measure light. Theyare used to study how far light penetrates into the wa
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Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments