Teltron tube

The beams can be bent by applying voltages to various electrodes in the tube or by holding a magnet close by.

A few of the electrons in the beam collide with the helium atoms, causing them to fluoresce and emit light.

From the cathode (-) electrons are emitted and accelerated by the electric field towards the positively charged anode (+).

Through a hole in the anode, the electrons leave the beam-forming system and the Wehnelt cylinder bundles.

When the heater is energized, the heating coil will cause electrons to emerge from it due to thermionic emission.

The higher the coil current, the stronger magnetic field and thus smaller radius of the circular path of the electrons.