Hornsby Water Clock
... that the pendulum in the Hornsby Water Clock has the same four-second time cycle as the one in Big Ben, but a heavier counterweight?
... that the <a href="./Pendulum" id="mwEmY" rel="mw:WikiLink" title="Pendulum">pendulum</a> in the <b id="mwEmc"><a href="./Hornsby_Water_Clock" id="mwEmg" rel="mw:WikiLink" title="Hornsby Water Clock">Hornsby Water Clock</a></b> has the same four-second time cycle as the one in <a href="./Big_Ben" id="mwEmk" rel="mw:WikiLink" title="Big Ben">Big Ben</a>, but a heavier <a href="./Counterweight" id="mwEmo" rel="mw:WikiLink" title="Counterweight">counterweight</a>?