Start Point lighthouse
...that the dioptic lens at Start Point lighthouse was the first of this kind to be used by Trinity House?
...that the dioptic lens at <b id="mwC2o"><a class="mw-redirect" href="./Start_Point_lighthouse" id="mwC2s" rel="mw:WikiLink" title="Start Point lighthouse">Start Point lighthouse</a></b> was the first of this kind to be used by <a href="./Trinity_House" id="mwC2w" rel="mw:WikiLink" title="Trinity House">Trinity House</a>?