Schiehallion experiment
... that the 1774 Schiehallion experiment to calculate the density of the Earth also made the first use of contour lines to represent height?
... that the 1774 <b id="mwG90"><a href="./Schiehallion_experiment" id="mwG94" rel="mw:WikiLink" title="Schiehallion experiment">Schiehallion experiment</a></b> to calculate the <a href="./Density" id="mwG98" rel="mw:WikiLink" title="Density">density</a> of the <a href="./Earth" id="mwG-A" rel="mw:WikiLink" title="Earth">Earth</a> also made the first use of <a class="mw-redirect" href="./Contour_lines" id="mwG-E" rel="mw:WikiLink" title="Contour lines">contour lines</a> to represent height?