Sounding machine, with Bassnett's Patent Atmospheric Lead (a sounding tube.)
In: "Report on the Construction and Work in 1880 of United States Fish
Commission 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 XV, p. 53.