Please provide more context! "William" could refer to many people, and without knowing which William you're talking about, it's impossible to answer your question.

For example, are you asking about:

* William Harvey: Known for his groundbreaking work on blood circulation.

* William Gilbert: A pioneer in the study of magnetism and electricity.

* William Thomson, Lord Kelvin: A physicist who made significant contributions to thermodynamics and electricity.

* William Herschel: An astronomer who discovered Uranus.

Once you tell me which William you mean, I can tell you about his observations and experiments.