frog galvanoscope
... that the frog galvanoscope was tens of thousands times more sensitive to electric current than galvanometers available in the early nineteenth century?
... that the <b id="mwB2E"><a href="./Frog_galvanoscope" id="mwB2I" rel="mw:WikiLink" title="Frog galvanoscope">frog galvanoscope</a></b> was tens of thousands times more sensitive to <a href="./Electric_current" id="mwB2M" rel="mw:WikiLink" title="Electric current">electric current</a> than <a href="./Galvanometer" id="mwB2Q" rel="mw:WikiLink" title="Galvanometer">galvanometers</a> available in the early nineteenth century?