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Piano-wire sounding maching developed by Sir William Thomson, later Lord Kelvin.This machine was used by George Belknap to sound from the U. S. S. TUSCARORA ina cable survey across the North Pacific. He shipped it to Charles Sigsbee onthe C&GS; Steamer BLAKE who modified the machine to become the Sigsbee SoundingMachine. In: 150 Years of Service on the Seas .... Call No.GC29.2.U5 P5.