Briton-class
... that the lower masts of the Briton-class corvettes of the Royal Navy were iron, but the rest of the masts were made of wood?
... that the lower <a href="./Mast_(sailing)" id="mwEIk" rel="mw:WikiLink" title="Mast (sailing)">masts</a> of the <b id="mwEIo"><a class="mw-redirect" href="./Briton_class_corvette" id="mwEIs" rel="mw:WikiLink" title="Briton class corvette"><i id="mwEIw">Briton</i>-class</a></b> <a href="./Corvette" id="mwEI0" rel="mw:WikiLink" title="Corvette">corvettes</a> of the <a href="./Royal_Navy" id="mwEI4" rel="mw:WikiLink" title="Royal Navy">Royal Navy</a> were iron, but the rest of the masts were made of wood?