When the river is very low, and one's steamboat is 'drawing all the water' there is in the channel, -- or a few inches more, as was often the case in the old times, -- one must be painfully circumspect in his piloting. We used to have to 'sound' a number of particularly bad places almost every trip when the river was at a very low stage.
            
                
                     
                
            
            
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                    Chapter 12: Sounding
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