inventor in a solenoid with a lightbulb, a solenoid a type of electromagnet formed by a helical coil of wire whose length is substantially greater than its diameter, which generates a controlled magnetic fieldvictorian, vintage illustration, 19th century, - 靜電 幅插畫檔、美工圖案、卡通及圖標
jacques-arsène d'arsonval's galvanometer an electromechanical measuring instrument for electric current, victorian, vintage illustration, 19th century, 1890s - 靜電 幅插畫檔、美工圖案、卡通及圖標