turret deck ships
...that turret deck ships incurred lower canal tolls because tonnage measurements used to calculate those tolls did not account for the vessels' unique shape?
...that <b id="mwCzs"><a href="./Turret_deck_ship" id="mwCzw" rel="mw:WikiLink" title="Turret deck ship">turret deck ships</a></b> incurred lower <a href="./Canal" id="mwCz0" rel="mw:WikiLink" title="Canal">canal</a> tolls because <a href="./Tonnage" id="mwCz4" rel="mw:WikiLink" title="Tonnage">tonnage</a> measurements used to calculate those tolls did not account for the vessels' unique shape?