Teltron Tube

 I have been doing a lot of work recently with students doing A level Physics looking at the discovery of the electron and how electrons and behave in a magnetic field. This teltron tube is set up with Helmholtz coils to do just that.On the left a low voltage supply heats a wire so electrons are given off, and then on the right a high voltage supply attracts the electrons and fires them across the tube as a beam of electrons.