The ticket thus given may be demanded for inspection by any duly authorised navigation officer, and must be kept on board and at hand for that purpose. They must be shown at each toll station the vessel has to pass, as a passport that no further payment of toll is to be demanded. The tickets shall be delivered up to the last toll-station.Navigation officer shall have authority to check-measure vessels whenever they consider it necessary, and if the toll due according to the check, measurement exceeds that originally paid, the difference shall be payable at the toll-station which the vessel may arrive at, if the check-measurement, was made at some point other than a toll station. The officer collecting the difference shall endorse the ticket, showing the measurements, and noting the amount recovered in excess of the toll originally paid.
