Thomson e / m tube
Supplier: 3B Scientific
Evacuated glass flask containing i.a. electron gun with directly heated tungsten wire cathode and a cylindrical, collimating anode. The generated beam is allowed to stroke along a semi-transparent mica disc in the center of the tube. Luminescent coating on the front of the disc makes the beam appear. Two of the edges of the back are provided with graduated scales.
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Vane wheel for heat/air flow
Supplier: 3B Scientific
Vane wheel device is used for demonstrating air and heat flows generated by a burning candle, water vapour or other heat sources. Made of Aluminium and mountable on a long needle.