a geissler spectral tube is a sealed glass tube containing a low-pressure gas and two electrodes, invented by heinrich geissler in 1857 - 陰極射線管 幅插畫檔、美工圖案、卡通及圖標
history, science, philipp lenard’s apparatus a modified crookes tube featuring a thin aluminum foil window, the lenard window, that allowed cathode rays (electrons) to pass out of the vacuum and into the open air, vintage illustration 1898 19th century g - 陰極射線管 幅插畫檔、美工圖案、卡通及圖標
