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Hilgard's Ocean Salinometer.In: Report on the Construction and Work in 1880 of United States FishCommission Steamer FISH-HAWK, by Lieutenant Zera Luther Tanner, U. S. N.United States Commission of Fish and Fisheries.Part IX. Report of the Commissioner for 1881. Plate XVIII, p. 53. (Image credit: Archival Photograph by Mr. Steve Nicklas)