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Hilgard's Ocean Salinometer.In: Report on the Construction and Outfit of the United States Fish CommissionSteamer ALBATROSS, by Lieutenant-Commander Z. L. Tanner, U. S. N. UnitedStates Commission of Fish and Fisheries. Part XI. Report of the Commissionerfor 1883. Plate XLI, p. 111. (Image credit: Archival Photograph by Mr. Steve Nicklas)