New experiments on electricity, wherein the causes of thunder and lightning as well as the constant state of positive or negative electricity in the air or clouds, are explained ... Also a description of a doubler of electricity, and of the most sensible electrometer yet constructed. With other new experiments and discoveries in the science ..
Abraham Bennet's 1789 account of electrical experiments, printed at Derby for natural philosophers and instrument makers, describing his gold-leaf electrometer and doubler of electricity. Copperplate figures show turned brass and wood apparatus keyed with letters, candles and suspended pith balls, plus a dense black-ground engraving of radiating electrical discharge around a starred disc.
