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![Sounding machine with Negretti and Zambra deep-sea thermometer descending ship0396.jpg Sounding machine with Negretti and Zambra deep-sea thermometer descending](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship0396.jpg?itok=Yh5wB0DJ)
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Sounding machine with Negretti and Zambra deep-sea thermometer descending.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 XIII, p. 53. (Image credit: Archival Photograph by Mr. Steve Nicklas)