"We studied the light source in the direction of the magnetic force, we perforated the poles of the magnet; but even in the direction of the magnetic lines of force we found that our result was confirmed"

This quote by Pieter Zeeman is referring to a clinical experiment he conducted. He and his group studied the source of light in the direction of the magnetic force, and they perforated the poles of the magnet. This was done to measure the impact of the electromagnetic field on the source of light. After the experiment, they discovered that their outcomes were validated, even when they studied the magnetic lines of force. This suggests that the electromagnetic field had an impact on the light, which the experiment was successful. This quote is a testimony to the value of experimentation in the scientific process. By performing experiments, scientists can validate their theories and gain a better understanding of the world around them.