Heated Franck-Hertz Tube with Mercury Filling,115V
Franck-Hertz Tube with Mercury Filling and Heating Chamber (115 V, 50/60 Hz)

Franck-Hertz Tube with Hg
For demonstrating that free electrons colliding with mercury atoms emit energy in quantized packets and for determining the excitation energy of the (61S0 – 63P1) resonance line in mercury at 4.9 eV.
Highly evacuated cathode ray tube with mercury gas filling and plane-parallel electrodes in order to avoid distortion of field lines. Electrodes include an indirectly heated, oxide cathode, perforated to produce a homogenous electric field plus an anode grid and collector (counter) electrode. In order to raise the probability of collisions between electrons and mercury atoms to a sufficient amount, the tube needs to be heated using a special heater.
Heater: 4 to 12 V AC/DC
Grid voltage: 0 to 70 V
Countervoltage: 1.5 V approx.
Operating temperature: 200° C approx.
Dimensions of tube: 130 mm x 26 mm Ø approx.

Heater
For adjusting the vapor pressure in the mercury-filled Franck-Hertz tube. Spray painted metal housing with tube symbols printed on the front panel that are visible from a distance, ceramically insulated connection sockets, viewing windows, opening with spring clamp for thermometer in the lid, insulated carrying handle and built-in thermostat for adjusting temperature.
Heater: 115 V AC, 400 W
Temperature range: 160° to 240° C
Constant temperature precision: ± 5° C approx.
Dimensions: 240x160x150 mm
Weight: 3.5 kg

Additionally required:
U8482130 Power Supply Unit for Franck-Hertz Experiment
U11175 Analogue Oscilloscope