Magnetic arc stabilization

To achieve arc stabilization in the horizontal operating position, a small rod-shaped magnet may be mounted across the lamp axis, directly under the arc. Mounting the magnet under the lamp acts as a force to pull the arc downward, resulting in more arc stability. The strength of the magnetic field can be varied by adjusting the distance between the lamp and the arc – the nearer the magnet, the stronger the magnetic force. With correct stabilization, the arc should directly hit the anode face.