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Figure 4. Li-Cor photometer. This photometer was investigated by Dr. JeanBrouardel in 1974 in a quest for instruments of greater precision. Heinvestigated several including a Li-Cor quantum/radiometer/photometer developedby industry especially for measuring light in water or in air in relation tophotosynthesis. Construction date and details of study conditions are unknown. (Image credit: Oceanographic Museum of Monaco | Y. Berard)