Vacuum tube with wire in elongated annex, for investigating reflections of cathode rays Vacuum tube with wire for investigating cathode rays 1898
Vacuum tube with Faraday cylinder, for investigating reflections etc. of cathode rays Vacuum tube with Faraday cylinder for investigating cathode rays 1898
Vacuum tube with adjustable anti-cathode, Faraday cylinder, and two graduated circles and perforated cylinder for anode, for investigating reflections etc. of cathode rays Vacuum tube for investigating cathode rays 1898
Vacuum tube with mica wheel and perforated diaphragm, for investigating reflections etc. of cathode rays Vacuum tube with mica wheel for investigating cathode rays 1898