schweigger multiplier (c.1820), schweigger (1779-1857), wood engraving, published in 1877 - 伽伐尼 幅插畫檔、美工圖案、卡通及圖標
first electrochemical telegraph (1809), by soemmering (1755-1830), published in 1882 - 伽伐尼 幅插畫檔、美工圖案、卡通及圖標