"condensation water drain" (ball float steam trap), a classic mechanical design used to automatically remove condensate from steam-carrying pipes or vessels - 靜電 幅插畫檔、美工圖案、卡通及圖標
electrostatic generator for the generation of static electricity, published 1877 - 靜電 幅插畫檔、美工圖案、卡通及圖標
wireless telegraph by thomas edison (1847-1931), wood engraving, published 1892 - 靜電 幅插畫檔、美工圖案、卡通及圖標電報機
illustration of leyden jar that stores static electricity with cross section showing metal chain - 靜電 幅插畫檔、美工圖案、卡通及圖標
a gold-leaf electroscope is an instrument used to detect and measure electric charge - 靜電 幅插畫檔、美工圖案、卡通及圖標
zigzag spark of static electricity between two conductors in a 19th century scientific diagram - 靜電 幅插畫檔、美工圖案、卡通及圖標
inventor with electric coil and lightbulb, victorian, vintage illustration, 19th century, 1890s - 靜電 幅插畫檔、美工圖案、卡通及圖標
an electrical generator, apparatus of generating strong currents, victorian, vintage illustration, 19th century, 1890s - 靜電 幅插畫檔、美工圖案、卡通及圖標
