A characteristic feature of a Tamar barge was the warping horse which is painted white on Shamrock. Under the beam shelf are holes which sometimes had boxes fitted under them where rock salt was placed. As salt is hygroscopic, it pickles the wood so the deck would be washed with salt water at the end of each day and left overnight before the heat of the day dried the salt into the wood. Falmouth oyster dredgers and Thames shrimp bawleys by the nature of their work were constantly washed down with salt water so had a reputation for longevity.
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